fix(no-standalone-expect): Allow expect in fixture methods

[mskelton]

Fixes #400

---

Note

Permits expect inside Playwright fixture definitions by tracking .extend calls as a new fixture context and adds corresponding tests.

• Rule (src/rules/no-standalone-expect.ts):
  • Add fixture block type; treat .extend member calls as fixture context using isPropertyAccessor.
  • Allow expect within fixture blocks; keep existing restrictions elsewhere.
  • Import and use isPropertyAccessor; update call stack enter/exit logic for .extend.
• Tests (src/rules/no-standalone-expect.test.ts):
  • Add valid cases allowing expect in fixture definitions (base.extend, test.extend) and a case without await.

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[github-actions]

🎉 This PR is included in version 2.4.0 🎉

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• v2.4.0
• npm package (@latest dist-tag)
• GitHub release

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