feat: add Locator.description() getter

[yury-s]

Fixes #37863

[github-actions]

Test results for "MCP"

2557 passed, 108 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

2 failed
❌ [playwright-test] › ui-mode-test-network-tab.spec.ts:204 › should not preserve selection across test runs @macos-latest-node18-1
❌ [playwright-test] › reporter-html.spec.ts:3006 › created › execSync doesnt produce a second stdout attachment @macos-latest-node18-2

3 flaky

⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1079 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node18`
⚠️ [firefox-page] › page/page-event-request.spec.ts:182 › should return response body when Cross-Origin-Opener-Policy is set `@firefox-ubuntu-22.04-node18`
⚠️ [playwright-test] › ui-mode-test-output.spec.ts:80 › should show console messages for test `@macos-latest-node18-1`

47075 passed, 816 skipped

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Merge workflow run.