fix: run E2E tests after i18n completes on release PRs (#8091)

## Summary
- Fixes issue where locale commits would cancel in-progress E2E tests on
release PRs
- E2E tests now run **once** after i18n workflow completes for
version-bump PRs

## Changes
1. **Modified `ci-tests-e2e.yaml`**:
   - Added `workflow_call` trigger with `ref` and `pr_number` inputs
   - Added skip condition for version-bump PRs on `pull_request` trigger
- Updated checkout steps to use `inputs.ref` when called via
`workflow_call`

2. **Created `ci-tests-e2e-release.yaml`**:
   - Triggers on `workflow_run` completion of `i18n: Update Core`
   - Only runs for version-bump PRs from main repo
- Calls original E2E workflow via `workflow_call` (no job duplication)

## How it works
**Regular PRs:** `CI: Tests E2E` runs normally via `pull_request`
trigger

**Version-bump PRs:**
1. `CI: Tests E2E` skips (setup job condition fails)
2. `i18n: Update Core` runs and commits locale updates
3. `CI: Tests E2E (Release PRs)` triggers after i18n completes
4. Calls `CI: Tests E2E` via `workflow_call`
5. E2E tests run to completion without cancellation

## Test plan
- [x] Tested workflow_call chain on fork
- [x] Verify version-bump PR skips regular E2E workflow
- [x] Verify E2E runs after i18n completes on next release

Fixes the issue identified during v1.38.2 release where locale commits
caused E2E tests to restart multiple times.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8091-fix-run-E2E-tests-after-i18n-completes-on-release-PRs-2ea6d73d36508151a315ed1f415afcc6)
by [Unito](https://www.unito.io)

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

@@ -0,0 +1,65 @@
+# Description: Runs E2E tests for release PRs after i18n workflow completes
+name: 'CI: Tests E2E (Release PRs)'
+
+on:
+  workflow_run:
+    workflows: ['i18n: Update Core']
+    types: [completed]
+
+jobs:
+  check-eligibility:
+    runs-on: ubuntu-latest
+    # Only run if:
+    # 1. This is the main repository
+    # 2. The i18n workflow was triggered by a pull_request
+    # 3. The i18n workflow completed successfully or was skipped (no locale changes)
+    # 4. The branch is a version-bump branch
+    # 5. The PR is from the main repo (not a fork)
+    if: |
+      github.repository == 'Comfy-Org/ComfyUI_frontend' &&
+      github.event.workflow_run.event == 'pull_request' &&
+      (github.event.workflow_run.conclusion == 'success' || github.event.workflow_run.conclusion == 'skipped') &&
+      startsWith(github.event.workflow_run.head_branch, 'version-bump-') &&
+      github.event.workflow_run.head_repository.full_name == github.event.workflow_run.repository.full_name
+    outputs:
+      pr_number: ${{ steps.pr.outputs.result }}
+      head_sha: ${{ github.event.workflow_run.head_sha }}
+    steps:
+      - name: Log workflow trigger info
+        run: |
+          echo "Repository: ${{ github.repository }}"
+          echo "Event: ${{ github.event.workflow_run.event }}"
+          echo "Conclusion: ${{ github.event.workflow_run.conclusion }}"
+          echo "Head branch: ${{ github.event.workflow_run.head_branch }}"
+          echo "Head SHA: ${{ github.event.workflow_run.head_sha }}"
+          echo "Head repo: ${{ github.event.workflow_run.head_repository.full_name }}"
+
+      - name: Get PR Number
+        id: pr
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { data: prs } = await github.rest.pulls.list({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'open',
+            });
+
+            const pr = prs.find(p => p.head.sha === context.payload.workflow_run.head_sha);
+
+            if (!pr) {
+              console.log('No PR found for SHA:', context.payload.workflow_run.head_sha);
+              return null;
+            }
+
+            console.log(`Found PR #${pr.number} for version bump: ${context.payload.workflow_run.head_branch}`);
+            return pr.number;
+
+  run-e2e-tests:
+    needs: check-eligibility
+    if: needs.check-eligibility.outputs.pr_number != 'null'
+    uses: ./.github/workflows/ci-tests-e2e.yaml
+    with:
+      ref: ${{ needs.check-eligibility.outputs.head_sha }}
+      pr_number: ${{ needs.check-eligibility.outputs.pr_number }}
+    secrets: inherit