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/config/server-section_domain.yaml

@@ -3,7 +3,7 @@ release:
   name: gitea-unittests
   namespace: testing
 tests:
-  - it: "[default values] uses ingress host for DOMAIN|SSH_DOMAIN|ROOT_URL"
+  - it: "[default values] Use the ingress host for DOMAIN|SSH_DOMAIN|ROOT_URL"
     template: templates/secret_inlineConfig.yaml
     asserts:
       - documentIndex: 0
@@ -24,7 +24,7 @@ tests:
 
   ################################################
 
-  - it: "[no ingress hosts] uses gitea http service for DOMAIN|SSH_DOMAIN|ROOT_URL"
+  - it: "[no ingress hosts] Use the HTTP Service for DOMAIN|SSH_DOMAIN|ROOT_URL"
     template: templates/secret_inlineConfig.yaml
     set:
       ingress:
@@ -48,7 +48,7 @@ tests:
 
   ################################################
 
-  - it: "[provided via values] uses that for DOMAIN|SSH_DOMAIN|ROOT_URL"
+  - it: "[provided via values] Use the configured values for DOMAIN|SSH_DOMAIN|ROOT_URL"
     template: templates/secret_inlineConfig.yaml
     set:
       gitea.config.server.DOMAIN: provided.example.com
@@ -77,7 +77,7 @@ tests:
 
   ################################################
 
-  - it: "[route enabled] uses route host for DOMAIN|SSH_DOMAIN|ROOT_URL"
+  - it: "[route enabled] Use the Route host for DOMAIN|SSH_DOMAIN|ROOT_URL"
     template: templates/secret_inlineConfig.yaml
     set:
       route:
@@ -102,7 +102,7 @@ tests:
 
   ################################################
 
-  - it: "[route tls termination] uses https for ROOT_URL"
+  - it: "[route tls termination] Use https for ROOT_URL"
     template: templates/secret_inlineConfig.yaml
     set:
       route:
@@ -119,7 +119,7 @@ tests:
 
   ################################################
 
-  - it: "[HTTPRoute enabled] uses first hostname for DOMAIN|SSH_DOMAIN|ROOT_URL"
+  - it: "[HTTPRoute enabled] Use the first hostname for DOMAIN|SSH_DOMAIN|ROOT_URL"
     template: templates/secret_inlineConfig.yaml
     set:
       ingress:
@@ -152,7 +152,7 @@ tests:
 
   ################################################
 
-  - it: "[HTTPRoute tls] switches ROOT_URL to https"
+  - it: "[HTTPRoute tls] Switch ROOT_URL to https"
     template: templates/secret_inlineConfig.yaml
     set:
       ingress: