chore: add a job to check the PR milestone is set (#9966)

* chore: add a job to check the PR milestone is set

Signed-off-by: Mariam Fahmy <mariam.fahmy@nirmata.com>

* Update .github/workflows/check-milestone.yaml

Co-authored-by: Vishal Choudhary <vishal.choudhary@nirmata.com>
Signed-off-by: Mariam Fahmy <mariamfahmy66@gmail.com>

* Update .github/workflows/check-milestone.yaml

Co-authored-by: Vishal Choudhary <vishal.choudhary@nirmata.com>
Signed-off-by: Mariam Fahmy <mariamfahmy66@gmail.com>

* Update .github/workflows/check-milestone.yaml

Co-authored-by: Vishal Choudhary <vishal.choudhary@nirmata.com>
Signed-off-by: Mariam Fahmy <mariamfahmy66@gmail.com>

* fix: remove the release branch from the milestone check

Signed-off-by: Mariam Fahmy <mariam.fahmy@nirmata.com>

---------

Signed-off-by: Mariam Fahmy <mariam.fahmy@nirmata.com>
Signed-off-by: Mariam Fahmy <mariamfahmy66@gmail.com>
Co-authored-by: Vishal Choudhary <vishal.choudhary@nirmata.com>

.github/workflows/check-milestone.yaml

@@ -0,0 +1,33 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+
+name: check-milestone
+
+permissions: {}
+
+on:
+  pull_request:
+    branches:
+      - 'main'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check-milestone:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check milestone
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          script: |
+            const { data } = await github.request("GET /repos/{owner}/{repo}/pulls/{pr}", {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pr: context.payload.pull_request.number
+            });
+            if (data.milestone) {
+              core.info(`This pull request has a milestone set: ${data.milestone.title}`);
+            } else {
+              core.setFailed(`A milestone need to be set on this pull request.`);
+            }