fix(contract_manager): rethrow unhandled rejections, fix p-cancelable typo

[dhruvja]

Summary

Two small fixes in sync_wormhole_guardian_set.ts:

• The unhandledRejection handler only filters out the p-cancelable race error and falls through with no re-throw, silently swallowing every other rejection. The sister uncaughtException handler re-throws non-matching errors; mirror that behavior so unexpected failures crash loudly.
• Rename isPancelableRaceError → isPCancelableRaceError (the underlying library is https://github.com/sindresorhus/p-cancelable).

How has this been tested?

• Current tests cover my changes
• Added new tests
• Manually tested the code

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