Backport #5610 to release-2.29. (#5677)

This backports GHA REST CI to release-2.29 to unblock REST CI failures
due to the gitlab CI being removed in the upstream internal repository.

---
TYPE: NO_HISTORY
DESC: Backport #5610 to release-2.29.

Author: shaunrd0

.github/workflows/ci-rest.yml

@@ -0,0 +1,37 @@
+name: REST CI
+
+on:
+  workflow_call:
+
+jobs:
+  rest-ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      # For easy access to lookup dispatched CI job.
+      - name: Print URL for REST CI actions
+        run: echo https://github.com/TileDB-Inc/TileDB-Internal/actions
+
+      # If this workflow fails on the remote repository, this CI job will also fail.
+      - name: Workflow dispatch to REST CI
+        id: trigger-step
+        uses: the-actions-org/workflow-dispatch@v4
+        env:
+          TILEDB_REST_CI_PAT: secrets.TILEDB_REST_CI_PAT
+        if: env.TILEDB_REST_CI_PAT != null
+        with:
+          repo: TileDB-Inc/TileDB-Internal
+          # Trigger workflow on TileDB-Internal checked out at this ref.
+          ref: "main"
+          workflow: rest-ci.yml
+          token: ${{ secrets.TILEDB_REST_CI_PAT }}
+          # The references set here will be passed to REST CI to checkout for testing.
+          # These can be temporarily modified if you want to test your changes against a specific branch.
+          # github.head_ref will only be set for PRs, so fallback to github.ref_name if triggered via push event.
+          inputs: |
+            {
+              "tiledb_ref": "${{ github.event.inputs.ref || github.head_ref || github.ref_name }}",
+              "tiledb_cloud_rest_ref": "master",
+              "tiledb_server_ref": "main"
+            }
+          wait-for-completion-timeout: 120m

.github/workflows/full-ci.yml

@@ -133,6 +133,10 @@ jobs:
   ci_docker:
     uses: ./.github/workflows/build-dockerfile.yml
 
+  ci_rest:
+    uses: ./.github/workflows/ci-rest.yml
+    secrets: inherit
+
   # dummy job for branch protection check
   full_ci_passed:
     needs: [