Mm 67896 manual cherry pick onto release 10.11 (#35989)

* improves time limit checks

* consistently check for presence of patch fields

* fix variable shadowing in test

* allow idempotent pinning operations with time limit expired

* new utility function for post limit time check

* fix style issue

* Add missing E2E CI files and delivery-platform migration for release-10.11

- Add calculate-playwright-results and calculate-cypress-results GitHub Actions
  (referenced by e2e-tests-playwright-template.yml and e2e-tests-cypress-template.yml
  but never backported to release-10.11)
- Add e2e-tests/playwright/merge.config.mjs (required by merge-reports step)
- Add run-specs Makefile target and server.run_specs.sh (required by run-failed-tests job)
- Fix merge-shard-results step: pin @playwright/test version and add fallback
  for when no blob reports exist (json reporter output used directly)
- Remove pull_request trigger from e2e-tests-ci.yml (delivery-platform migration)
- Remove dead e2e-fulltests-ci.yml and e2e-tests-ci-template.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: yasserfaraazkhan <attitude3cena.yf@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/e2e-tests-playwright-template.yml

@@ -228,8 +228,16 @@ jobs:
           mkdir -p results/reporter
 
           # Merge blob reports using Playwright merge-reports (per docs)
-          npm install --no-save @playwright/test
-          npx playwright merge-reports --config merge.config.mjs ./shard-results/results/blob-report/
+          # Pin version to match the one used to generate blob reports (avoids format mismatch)
+          PW_VERSION=$(node -e "const p=require('./package.json');process.stdout.write(p.dependencies?.['@playwright/test']||p.devDependencies?.['@playwright/test']||'')")
+          npm install --no-save @playwright/test@${PW_VERSION}
+          npx playwright merge-reports --config merge.config.mjs ./shard-results/results/blob-report/ || true
+
+          # If merge-reports produced no results.json (no blob reports), fall back to
+          # the json reporter output written directly by the test shard
+          if [ ! -f results/reporter/results.json ] && [ -f shard-results/results/reporter/results.json ]; then
+            cp shard-results/results/reporter/results.json results/reporter/results.json
+          fi
       - name: ci/calculate
         id: calculate
         uses: ./.github/actions/calculate-playwright-results