fix(e2e): add orchestrator glob to SHOWCASE_K8S testIgnore (backport from #4327) (#4406)

Backport the playwright config fix from PR #4327 to release-1.9.
Adds orchestrator/**/*.spec.ts glob pattern to SHOWCASE_K8S testIgnore
to properly exclude all orchestrator tests in K8S test runs.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: gustavolira

e2e-tests/playwright.config.ts

@@ -142,6 +142,7 @@ export default defineConfig({
         "**/playwright/e2e/github-happy-path.spec.ts",
         "**/playwright/e2e/dynamic-home-page-customization.spec.ts",
         "**/playwright/e2e/plugins/scorecard/scorecard.spec.ts",
+        "**/playwright/e2e/plugins/orchestrator/**/*.spec.ts",
       ],
     },
     {