fix: prevent double teardown on test environment error

[noomorph]

Summary

• Resolves: [Bug]: Jest 30 environment teardown error handling regression #15730

This PR fixes a regression where errors thrown from a custom environment’s teardown() method were masked by an internal error, rather than being reported to the user. This led to confusing error messages and made debugging custom environments difficult.

• Ensures that isTornDown is always set in a finally block, even if environment.teardown() throws. This prevents double teardown and ensures the real error is surfaced.
• Adds a real end-to-end (e2e) test that:
  • Uses a custom environment that throws in teardown()
  • Asserts that Jest reports the actual error, not an internal or misleading one
  • Prevents future regressions of this kind

Why

• The regression was reported in #15730.
• Without this fix, users see a confusing internal error (The "object" argument must be of type object. Received null) instead of the real cause.
• The new e2e test ensures this scenario is covered in CI.

Test plan

• The new e2e test fails on the old behavior and passes with this fix.
• The test runs a trivial test file using a custom environment that throws in teardown(), and asserts that the error is reported as expected.
• CI will now catch regressions of this kind.

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commit: cac64d4

[noomorph]

Please note that the test coverage reduction report is erroneous. This case has been covered by E2E test I added.

[cpojer]

Thank you!

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