Repo: [strict-boolean-expressions.test.ts] Switch auto-generated test cases to hand-written

[JoshuaKGoldberg]

Suggestion

Some RuleTester tests in this repo are generated dynamically. Auto-generating tests like that can help create comprehensive test coverage for rules - but:

• They tended to exponentially grow in size as more cases get grown
  • This is especially bad for slow typed tests: e.g. Tests: Reduce the giant number of naming-convention tests #9691
• They make it hard to see what cases are or aren't being tested
• They're not very statically analyzable

We'd like to move away from these auto-generated / dynamic test cases. That specifically means making all test cases passed to RuleTester be completely inline plain old JavaScript objects. No .flatMaps/.maps, no dedupeTestCases, helper functions, etc.

This issue tracks doing so for packages/eslint-plugin/tests/rules/strict-boolean-expressions.test.ts.

Additional Info

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