devops: do not run tests if build failed

[yury-s]

Otherwise we get this:

  1) [chromium] › packages/web/src/components/codeMirrorWrapper.spec.tsx:71:5 › highlight JavaScript 

    Error: browserType.launch: Executable doesn't exist at /home/runner/.cache/ms-playwright/chromium_headless_shell-1200/chrome-headless-shell-linux64/chrome-headless-shell
    ╔═════════════════════════════════════════════════════════════════════════╗
    ║ Looks like Playwright Test or Playwright was just installed or updated. ║
    ║ Please run the following command to download new browsers:              ║
    ║                                                                         ║
    ║     npx playwright install                                              ║
    ║                                                                         ║
    ║ <3 Playwright Team                                                      ║
    ╚═════════════════════════════════════════════════════════════════════════╝

[github-actions]

Test results for "MCP"

2640 passed, 116 skipped

---

Merge workflow run.

[github-actions]

Test results for "tests 1"

5 flaky

⚠️ [chromium-library] › library/headful.spec.ts:233 › should click in OOPIF `@chromium-ubuntu-22.04-node18`
⚠️ [chromium-library] › library/beforeunload.spec.ts:130 › should support dismissing the dialog multiple times `@chromium-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1079 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node18`
⚠️ [playwright-test] › ui-mode-test-output.spec.ts:80 › should show console messages for test `@macos-latest-node18-2`
⚠️ [chromium-library] › library/popup.spec.ts:258 › should not throw when click closes popup `@ubuntu-22.04-chromium-tip-of-tree`

40148 passed, 786 skipped

---

Merge workflow run.

[yury-s]

Subsumed by #38187