Consider moving releaseLock to setupExitHandlers cleanup in relayerHelpers.ts

[coderabbitai]

As per this comment in PR #377, we should consider moving releaseLock from updateStateFile to setupExitHandlers during cleanup. This issue is created as requested by @fcanela.

[fcanela]

During the refactor we noticed that the releaseLock logic was placed in an incorrect place: it would release the lock unintentionally, allowing multiple executions of the app.

The logic should me moved so the lockfile is only released when the application is about to exit.