ci: restrict workflow to main branch PRs (#4677)

This pull request updates GitHub Actions workflow configuration files to
ensure that automated checks and labeling only run for pull requests
targeting specific branches, primarily `main`. This helps prevent
workflows from running unnecessarily on other branches and tightens
control over automation.

Workflow branch targeting updates:

* Updated `.github/workflows/auto-labelerV2.yml` to trigger the Auto
Pull Request Labeler V2 workflow only when pull requests target the
`main` or `V2` branches.
* Updated `.github/workflows/check_properties.yml` to trigger the check
only for pull requests targeting the `main` branch.

Workflow execution condition:

* Added a condition to the `check-files` job in
`.github/workflows/check_properties.yml` so it only runs if the pull
request's base branch is `main`.

.github/workflows/auto-labelerV2.yml

@@ -2,6 +2,9 @@ name: "Auto Pull Request Labeler V2"
 on:
   pull_request_target:
     types: [opened, synchronize]
+    branches:
+      - main
+      - V2
 
 permissions:
   contents: read

.github/workflows/check_properties.yml

@@ -5,6 +5,8 @@ on:
     types: [opened, synchronize, reopened]
     paths:
       - "app/core/src/main/resources/messages_*.properties"
+    branches:
+      - main
 
 # cancel in-progress jobs if a new job is triggered
 # This is useful to avoid running multiple builds for the same branch if a new commit is pushed