fix: clean up publish SIGINT listeners

[OskarEichler]

Summary

• scope the publish SIGINT handler to the active publish operation
• remove the handler after both successful and failed publishes
• add regressions for resolve and reject paths

Why

The publish command removed its one-time SIGINT listener only in the error path. Every successful programmatic publish left a listener attached, eventually causing listener warnings and cancelling stale packagers when a later SIGINT arrived.

Tests

• TEST_FILES=publishSignalTest corepack pnpm ci:test
• corepack pnpm compile
• corepack pnpm ci:validate
• git diff --check

Breaking changes

None.

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Latest commit: 4362f7b

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