Revert "feat(expect): toHaveCSS with object notation (#38982)"

[dgozman]

This reverts commit 750fc94.

[github-actions]

Test results for "MCP"

2 failed
❌ [chrome] › mcp/evaluate.spec.ts:79 › browser_evaluate (error) @mcp-macos-latest
❌ [chrome] › mcp/http.spec.ts:207 › http transport browser lifecycle (persistent) @mcp-macos-latest

5125 passed, 164 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

2 failed
❌ [webkit-library] › library/proxy.spec.ts:127 › should allow bypassing [::1] requests @webkit-ubuntu-22.04-node20
❌ [playwright-test] › ui-mode-test-network-tab.spec.ts:397 › should not preserve selection across test runs @macos-latest-node20

5 flaky

⚠️ [chromium-library] › library/trace-viewer.spec.ts:1230 › should display language-specific locators `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/video.spec.ts:356 › screencast › should capture navigation `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/popup.spec.ts:260 › should not throw when click closes popup `@chromium-ubuntu-22.04-node22`
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1080 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node20`
⚠️ [webkit-library] › library/trace-viewer.spec.ts:1230 › should display language-specific locators `@webkit-ubuntu-22.04-node20`

38918 passed, 842 skipped

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Merge workflow run.