Provisioning: Begin using secrets store (#108044)

- Provisioning: Begin using secrets store
- Refactor integration with secrets store
- Add back the legacy service
- Separate concerns for encrypt and decrypt
- Handle update within Encrypt function
- Add interface for secure value service
- Add feature flag for using secrets service
- Add the dual service for temporary solution.

* Add first integration tests for encrypted tokens
* Add integration test for app platform secrets
* Validate it has the name or not
* Create wire provider
* Always save to the secret if provided secret

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Co-authored-by: Roberto Jimenez Sanchez <roberto.jimenez@grafana.com>
Co-authored-by: Roberto Jiménez Sánchez <jszroberto@gmail.com>

pkg/tests/apis/provisioning/testdata/git-readonly.json.tmpl

@@ -0,0 +1,24 @@
+{
+    "apiVersion": "provisioning.grafana.app/v0alpha1",
+    "kind": "Repository",
+    "metadata": {
+        "name": "{{ or .Name "git-repository" }}"
+    },
+    "spec": {
+        "title": "{{ or .Title .Name "Git repository" }}",
+        "description": "{{ or .Description .Name "Load grafana dashboard from fake repository" }}",
+        "type": "git",
+        "git": {
+            "url": "{{ or .URL "https://github.com/grafana/grafana-git-sync-demo" }}",
+            "branch": "{{ or .Branch "integration-test" }}",
+            "token": "{{ or .Token "" }}",
+            "path": "{{ or .Path "grafana/" }}"
+        },
+        "sync": {
+            "enabled": {{ if .SyncEnabled }} true {{ else }} false {{ end }},
+            "target": "{{ or .SyncTarget "folder" }}",
+            "intervalSeconds": {{ or .SyncIntervalSeconds 60 }}
+        },
+        "workflows": []
+    }
+}