ci: updates workflows to use release-please for release management (#2610)

Author: gavinbarron

.github/workflows/push-release.yml

@@ -5,7 +5,7 @@ name: Release latest
 
 on:
   push:
-    branches: [release/latest]
+    tags: ['v3.*']
 
 jobs:
   version:

.github/workflows/run-release-please.yml

@@ -0,0 +1,24 @@
+# when the main branch is updated this workflow will run and create or update a combined [release PR](https://github.com/googleapis/release-please#whats-a-release-pr)
+# upon approval of the release PR as it adds a v3.x tag the [push-release.yml](./push-release.yml) workflow will run, push the release to npm and update the GitHub 
+# release with the mgt-spfx sppkg file
+
+on:
+    push:
+      branches:
+        - main
+  
+  permissions:
+    contents: write
+    pull-requests: write
+  
+  name: Run Release Please
+  jobs:
+    release-please:
+      runs-on: ubuntu-latest
+      steps:
+        - uses: google-github-actions/release-please-action@v2
+          id: release
+          with:
+            command: manifest
+            token: ${{secrets.GITHUB_TOKEN}}
+            default-branch: main