test: normalize the titles of the helm unit tests

The contributor guidelines require that the title of a unit test is "a short sentence starting with a capital
letter and ending without a period". Only 30 of the 269 titles followed that rule. The remaining ones were
lowercase verb phrases ("renders a deployment"), which made the test output read inconsistently depending on
which suite was running, and made it impossible to tell a convention violation from an intentional style.

All titles are now imperative, capitalized and unquoted-safe:

  renders a deployment                                 -> Render a Deployment
  should not render when gatewayAPI.enabled is false   -> Skip rendering when gatewayAPI.enabled is false
  skips gpg volume spec                                -> Skip the gpg volume spec

The bracketed prefixes of the dependency checks and of the server section suite are kept, because they group
the tests by the chart they assert on. Only the sentence behind the prefix was rewritten.

Beyond the pure capitalization three classes of titles needed real rewording:

- The titles in image-configuration.yaml named a subject instead of a scenario ("default values", "tag
  override", "digest and global registry"). They now describe what is rendered.
- init_directory_structure.sh-rootless.yaml carried "it does not chown /data ...", which rendered as
  "it it does not chown" in the test output.
- The "should" prefix in the Gateway API and route suites added no information once the title is a sentence.

The title of the GIT_GC_REPOS test lost its embedded double quotes. The title was previously an unquoted YAML
scalar, so the quotes were literal characters; quoting the title turned them into a parse error. The value is
unambiguous without them.

Three byte-identical tests asserting pgpool.adminPassword existed in customization-integrity-postgresql-ha.yaml
- same template, same assertion, same expected value. They were a copy-paste artifact and shared one title, so
two of them are removed. No coverage is lost, which is why the test count drops from 269 to 267.

No snapshot files are tracked and no suite uses matchSnapshot, so retitling cannot invalidate stored snapshots.

Co-authored-by: Copilot <copilot@github.com>

unittests/helm/deployment/image-configuration.yaml

@@ -14,13 +14,13 @@ templates:
   - templates/secret_inlineConfig.yaml
   - templates/secret_metrics.yaml
 tests:
-  - it: default values
+  - it: "Render the default image reference"
     template: templates/deployment.yaml
     asserts:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3-rootless"
-  - it: tag override
+  - it: "Render a custom image tag"
     template: templates/deployment.yaml
     set:
       deployment.gitea.image.tag: "1.19.4"
@@ -28,7 +28,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.4-rootless"
-  - it: root-based image
+  - it: "Render the root-based image variant"
     template: templates/deployment.yaml
     set:
       deployment.gitea.image.rootless: false
@@ -36,7 +36,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3"
-  - it: scoped registry
+  - it: "Render a scoped image registry"
     template: templates/deployment.yaml
     set:
       deployment.gitea.image.registry: "example.com"
@@ -44,7 +44,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "example.com/gitea:1.19.3-rootless"
-  - it: global registry
+  - it: "Render the global image registry"
     template: templates/deployment.yaml
     set:
       global.imageRegistry: "global.example.com"
@@ -52,7 +52,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "global.example.com/gitea:1.19.3-rootless"
-  - it: digest for rootless image
+  - it: "Render a digest for the rootless image"
     template: templates/deployment.yaml
     set:
       deployment:
@@ -64,7 +64,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3-rootless@sha256:b28e8f3089b52ebe6693295df142f8c12eff354e9a4a5bfbb5c10f296c3a537a"
-  - it: image fullOverride (does not append rootless)
+  - it: "Render image.fullOverride without appending the rootless suffix"
     template: templates/deployment.yaml
     set:
       deployment:
@@ -81,7 +81,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3"
-  - it: digest for root-based image
+  - it: "Render a digest for the root-based image"
     template: templates/deployment.yaml
     set:
       deployment:
@@ -93,7 +93,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3@sha256:b28e8f3089b52ebe6693295df142f8c12eff354e9a4a5bfbb5c10f296c3a537a"
-  - it: digest and global registry
+  - it: "Render a digest together with the global image registry"
     template: templates/deployment.yaml
     set:
       global.imageRegistry: "global.example.com"
@@ -102,7 +102,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "global.example.com/gitea:1.19.3-rootless@sha256:b28e8f3089b52ebe6693295df142f8c12eff354e9a4a5bfbb5c10f296c3a537a"
-  - it: correctly renders floating tag references
+  - it: "Render unquoted floating tag references"
     template: templates/deployment.yaml
     set:
       # use non-quoted values on purpose. See: https://gitea.com/gitea/helm-gitea/issues/631
@@ -123,7 +123,7 @@ tests:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.21-rootless"
-  - it: init containers use their own image configuration
+  - it: "Render the own image configuration of the init containers"
     template: templates/deployment.yaml
     set:
       deployment.initDirectories.image.registry: "init.example.com"