Speed up hosted full E2E dispatch

.github/workflows/tests.yml

@@ -308,7 +308,7 @@ jobs:
     timeout-minutes: 60
     strategy:
       fail-fast: false
-      max-parallel: 2
+      max-parallel: ${{ fromJSON(github.event_name == 'workflow_dispatch' && inputs.runner_pool == 'github-hosted' && '8' || '2') }}
       matrix:
         browser: [chromium, webkit, firefox]
         device: [mobile, desktop, tablet]

tests/unit/playwright-full-workflow.spec.js

@@ -30,10 +30,12 @@ describe("Playwright full E2E workflow grouping", () => {
     );
   });
 
-  it("keeps full-suite runner pressure bounded and diagnosable", () => {
+  it("keeps self-hosted full-suite runner pressure bounded while hosted dispatch can fan out", () => {
     const source = workflowSource();
 
-    expect(source).toMatch(/e2e-full:[\s\S]*?max-parallel: 2/u);
+    expect(source).toMatch(
+      /e2e-full:[\s\S]*?max-parallel: \$\{\{ fromJSON\(github\.event_name == 'workflow_dispatch' && inputs\.runner_pool == 'github-hosted' && '8' \|\| '2'\) \}\}/u
+    );
     expect(source).toMatch(/e2e-full:[\s\S]*?PLAYWRIGHT_WORKERS: 1/u);
     expect(source).toMatch(/e2e-full:[\s\S]*?PLAYWRIGHT_VIDEO_MODE: off/u);
     expect(source).toContain("scripts/ci/with-systemd-inhibit.sh");