[backport core/1.43] ci: filter e2e workflow + add e2e-status gate (#11592)

Backport of #11568 to `core/1.43`.

## Changes

Applies the e2e workflow filtering changes from #11568 to the
`core/1.43` release branch:

- **ci-tests-e2e.yaml**: Removed `paths-ignore` from `pull_request`
trigger, added `changes` job using `dorny/paths-filter` to detect
e2e-relevant file changes, added `needs: changes` and `should_run`
conditions to `setup`, `merge-reports`, `comment-on-pr-start`, and
`deploy-and-comment` jobs.
- **ci-tests-e2e-forks.yaml**: Switched `download-artifact` from
`actions/download-artifact@v7` to
`dawidd6/action-download-artifact@v12`, added `if_no_artifact_found:
warn`, added `hashFiles('reports/**') != ''` condition to `Handle Test
Completion`.
- **ci-tests-e2e-coverage.yaml**: Skipped — file does not exist on
`core/1.43`.

## Conflict Resolution

- Kept `core/1.43` branch's existing structure: container image
`0.0.16`, cloud build steps, `cloud` browser matrix entry, `Get PR
Number` step (not `resolve-pr-from-workflow-run`),
`pnpm/action-setup@v4.4.0`.
- Applied only the PR's intended behavioral changes on top.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-11592-backport-core-1-43-ci-filter-e2e-workflow-on-PRs-to-skip-unrelated-changes-34c6d73d36508158ac90c13b298132fb)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>

.github/workflows/ci-tests-e2e.yaml

@@ -7,7 +7,6 @@ on:
     paths-ignore: ['**/*.md']
   pull_request:
     branches-ignore: [wip/*, draft/*, temp/*]
-    paths-ignore: ['**/*.md']
   workflow_dispatch:
 
 concurrency:
@@ -15,7 +14,36 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  # Detect whether e2e-relevant files changed. Required checks see "skipped"
+  # (which counts as passing) when only docs/apps/storybook files are touched,
+  # avoiding the stall that paths-ignore would cause.
+  changes:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    outputs:
+      should_run: ${{ github.event_name != 'pull_request' || steps.filter.outputs.e2e }}
+    steps:
+      - name: Checkout repository
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: actions/checkout@v6
+      - name: Check for e2e-relevant changes
+        if: ${{ github.event_name == 'pull_request' }}
+        id: filter
+        uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
+        with:
+          predicate-quantifier: 'every'
+          filters: |
+            e2e:
+              - '**'
+              - '!apps/**'
+              - '!docs/**'
+              - '!.storybook/**'
+              - '!**/*.md'
+
   setup:
+    needs: changes
+    if: ${{ needs.changes.outputs.should_run == 'true' }}
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
@@ -153,9 +181,9 @@ jobs:
 
   # Merge sharded test reports (no container needed - only runs CLI)
   merge-reports:
-    needs: [playwright-tests-chromium-sharded]
+    needs: [changes, playwright-tests-chromium-sharded]
     runs-on: ubuntu-latest
-    if: ${{ !cancelled() }}
+    if: ${{ !cancelled() && needs.changes.outputs.should_run == 'true' }}
     steps:
       - name: Install pnpm
         uses: pnpm/action-setup@fc06bc1257f339d1d5d8b3a19a8cae5388b55320 # v4.4.0
@@ -184,14 +212,35 @@ jobs:
           path: ./playwright-report/
           retention-days: 30
 
+  e2e-status:
+    if: ${{ always() }}
+    needs: [changes, playwright-tests-chromium-sharded, playwright-tests]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check E2E results
+        env:
+          SHOULD_RUN: ${{ needs.changes.outputs.should_run }}
+          SHARDED: ${{ needs.playwright-tests-chromium-sharded.result }}
+          BROWSERS: ${{ needs.playwright-tests.result }}
+        run: |
+          [[ "$SHOULD_RUN" != "true" ]] && echo "E2E skipped" && exit 0
+          [[ "$SHARDED" != "success" || "$BROWSERS" != "success" ]] && echo "E2E failed" && exit 1
+          echo "E2E passed"
+
   #### BEGIN Deployment and commenting (non-forked PRs only)
   # when using pull_request event, we have permission to comment directly
   # if its a forked repo, we need to use workflow_run event in a separate workflow (pr-playwright-deploy.yaml)
 
   # Post starting comment for non-forked PRs
   comment-on-pr-start:
+    needs: changes
     runs-on: ubuntu-latest
-    if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork == false
+    if: >-
+      ${{
+        needs.changes.outputs.should_run == 'true' &&
+        github.event_name == 'pull_request' &&
+        github.event.pull_request.head.repo.fork == false
+      }}
     permissions:
       pull-requests: write
     steps:
@@ -210,9 +259,15 @@ jobs:
 
   # Deploy and comment for non-forked PRs only
   deploy-and-comment:
-    needs: [playwright-tests, merge-reports]
+    needs: [changes, playwright-tests, merge-reports]
     runs-on: ubuntu-latest
-    if: always() && github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork == false
+    if: >-
+      ${{
+        always() &&
+        needs.changes.outputs.should_run == 'true' &&
+        github.event_name == 'pull_request' &&
+        github.event.pull_request.head.repo.fork == false
+      }}
     permissions:
       pull-requests: write
       contents: read