Fallback to new Reaper when reused Reaper is unreachable

[cristianrgreco]

Summary of changes

• Make Reaper reuse best-effort: if connecting to a discovered running Reaper fails, try other candidates and then create a new Reaper in the same lock cycle.
• Update Reaper discovery to return all running candidates and prefer newer ones first.
• Add a regression test that simulates an unreachable reused Reaper and verifies fallback creation of a new Reaper.

Verification commands run

• npm run format
• npm run lint
• npm run test -- packages/testcontainers/src/reaper/reaper.test.ts

Test results summary

• packages/testcontainers/src/reaper/reaper.test.ts: 1 file passed, 9 tests passed.

Closes #1025

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