Plugins: Add integration test for provisioned plugin dashboard import (#105681)

* add test

* make it fail

* get test work reliably

* get or create db section

* remove unnecessary code

* move test to first

* add comment

* apply PR feedback

pkg/services/pluginsintegration/plugintest/testdata/provisioning/apps.yaml

@@ -0,0 +1,11 @@
+apiVersion: 1
+
+apps:
+  - type: test-app
+    org_id: 1
+    org_name: Main Org.
+    disabled: false
+    jsonData:
+      apiKey: "test-api-key"
+    secureJsonData:
+      secretKey: "test-secret-key"