[GitHub Actions] Change Auto-Label Trigger (#228)

- The execution of applying labels is now in a dispatched workflow that executes from the default branch and has access to the GitHub App to be able to write labels.
- New GitHub Actions to enable/toggle workflows from activating during import of subprojects.
- Workflows to add new subtrees to develop and release branches.

.github/repos-added-config.json

@@ -0,0 +1,36 @@
+{
+  "repositories": [
+    {
+      "name": "clr",
+      "url": "ROCm/clr",
+      "branch": "amd-staging",
+      "category": "projects",
+      "auto_subtree_pull": true,
+      "auto_subtree_push": false
+    },
+    {
+      "name": "hip",
+      "url": "ROCm/hip",
+      "branch": "amd-staging",
+      "category": "projects",
+      "auto_subtree_pull": true,
+      "auto_subtree_push": false
+    },
+    {
+      "name": "hipother",
+      "url": "ROCm/hipother",
+      "branch": "amd-staging",
+      "category": "projects",
+      "auto_subtree_pull": true,
+      "auto_subtree_push": false
+    },
+    {
+      "name": "hip-tests",
+      "url": "ROCm/hip-tests",
+      "branch": "amd-staging",
+      "category": "projects",
+      "auto_subtree_pull": true,
+      "auto_subtree_push": false
+    }
+  ]
+}