fix(ui mode): do not render anonymous describe

[dgozman]

Tests inside the anonymous describe are flatten into the parent suite.

Fixes #30476.

[github-actions[bot]]

Test results for "tests 1"

5 failed :x: [playwright-test] › ui-mode-test-tree.spec.ts:338:5 › should update parametrized tests @macos-latest-node18-1 :x: [playwright-test] › ui-mode-test-tree.spec.ts:338:5 › should update parametrized tests @ubuntu-latest-node18-1 :x: [playwright-test] › ui-mode-test-tree.spec.ts:338:5 › should update parametrized tests @ubuntu-latest-node20-1 :x: [playwright-test] › ui-mode-test-tree.spec.ts:338:5 › should update parametrized tests @ubuntu-latest-node22-1 :x: [playwright-test] › ui-mode-test-tree.spec.ts:338:5 › should update parametrized tests @windows-latest-node18-1

2 flaky

:warning: [installation tests] › playwright-electron-should-work.spec.ts:44:5 › should work when wrapped inside @playwright/test and trace is enabled @package-installations-macos-latest
:warning: [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

36946 passed, 650 skipped :heavy_check_mark::heavy_check_mark::heavy_check_mark:

Merge workflow run.

[github-actions[bot]]

Test results for "tests 1"

1 flaky

:warning: [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

36952 passed, 650 skipped :heavy_check_mark::heavy_check_mark::heavy_check_mark:

Merge workflow run.