chore!: remove emulated gitlab endpoints from keycloak (#483)

## Description

This removes the additional virtualservices we create for "emulating"
gitlab endpoints with keycloak. The initial reason these were added was
to support Mattermost's SSO setup, but SWF has been able to use the
keycloak endpoints directly.

Note that this is a breaking change technically but there are no known
downstream consumers of these virtualservices.

## Related Issue

N/A

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)(https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md#submitting-a-pull-request)
followed

src/keycloak/chart/templates/uds-package.yaml

@@ -119,45 +119,3 @@ spec:
                 - istio-mtls-client-certificate
               add:
                 istio-mtls-client-certificate: "%DOWNSTREAM_PEER_CERT%"
-
-      - description: "emulate gitlab authorize endpoint"
-        service: keycloak-http
-        selector:
-          app.kubernetes.io/name: keycloak
-        host: sso
-        port: 8080
-        advancedHTTP:
-          match:
-            - name: gitlab-authorize
-              uri:
-                prefix: /oauth/authorize
-          rewrite:
-            uri: "/realms/{{ .Values.realm }}/protocol/openid-connect/auth"
-
-      - description: "emulate gitlab user endpoint"
-        service: keycloak-http
-        selector:
-          app.kubernetes.io/name: keycloak
-        host: sso
-        port: 8080
-        advancedHTTP:
-          match:
-            - name: gitlab-user
-              uri:
-                prefix: /api/v4/user
-          rewrite:
-            uri: "/realms/{{ .Values.realm }}/protocol/openid-connect/userinfo"
-
-      - description: "emulate gitlab token endpoint"
-        service: keycloak-http
-        selector:
-          app.kubernetes.io/name: keycloak
-        host: sso
-        port: 8080
-        advancedHTTP:
-          match:
-            - name: gitlab-token
-              uri:
-                prefix: /oauth/token
-          rewrite:
-            uri: "/realms/{{ .Values.realm }}/protocol/openid-connect/token"