Ensure default customization of Chart dependencies (#748)

### Description of the change

This adds unittests for the default configuration of our dependencies.

### Benefits

We are able to detect changes in upstream Charts for those settings.

### Applicable issues

- fixes #409

### Additional information

I merged existing unittests with the new ones for `postgresql-ha` and `postgresql`.
However, I decided to not do this for `redis-cluster` and `redis`, because the existing tests[^1] also ensure how the Chart behaves when both redis dependencies are disabled. It didn't felt right to split those files.

### Checklist

- [x] Templating unittests are added

Signed-off-by: justusbunsi <sk.bunsenbrenner@gmail.com>

[^1]: e733287dc2/unittests/config/cache-config.yaml, e733287dc2/unittests/config/queue-config.yaml, e733287dc2/unittests/config/session-config.yaml

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/748
Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Co-committed-by: justusbunsi <sk.bunsenbrenner@gmail.com>

unittests/config/database-section_postgresql-ha.yaml

@@ -1,30 +0,0 @@
-suite: config template | database section (postgresql-ha)
-release:
-  name: gitea-unittests
-  namespace: testing
-tests:
-  - it: connects to pgpool service
-    template: templates/gitea/config.yaml
-    set:
-      postgresql:
-        enabled: false
-      postgresql-ha:
-        enabled: true
-    asserts:
-      - documentIndex: 0
-        matchRegex:
-          path: stringData.database
-          pattern: HOST=gitea-unittests-postgresql-ha-pgpool.testing.svc.cluster.local:5432
-  - it: renders the referenced service
-    template: charts/postgresql-ha/templates/pgpool/service.yaml
-    set:
-      postgresql:
-        enabled: false
-      postgresql-ha:
-        enabled: true
-    asserts:
-      - containsDocument:
-          kind: Service
-          apiVersion: v1
-          name: gitea-unittests-postgresql-ha-pgpool
-          namespace: testing

unittests/config/database-section_postgresql.yaml

@@ -1,30 +0,0 @@
-suite: config template | database section (postgresql)
-release:
-  name: gitea-unittests
-  namespace: testing
-tests:
-  - it: "connects to postgresql service"
-    template: templates/gitea/config.yaml
-    set:
-      postgresql:
-        enabled: true
-      postgresql-ha:
-        enabled: false
-    asserts:
-      - documentIndex: 0
-        matchRegex:
-          path: stringData.database
-          pattern: HOST=gitea-unittests-postgresql.testing.svc.cluster.local:5432
-  - it: "renders the referenced service"
-    template: charts/postgresql/templates/primary/svc.yaml
-    set:
-      postgresql:
-        enabled: true
-      postgresql-ha:
-        enabled: false
-    asserts:
-      - containsDocument:
-          kind: Service
-          apiVersion: v1
-          name: gitea-unittests-postgresql
-          namespace: testing