fix(core): Prevent unhandled promise rejection in withMonitor

[RulaKhaled]

Problem

withMonitor function was causing unhandled promise rejections when wrapping async callbacks that throw errors. This could crash servers when monitoring async operations.

When a promise returned by the callback rejected, the error was being thrown inside the promise rejection handler:

Promise.resolve(maybePromiseResult).then(
  () => { finishCheckIn('ok'); },
  e => {
    finishCheckIn('error');
    throw e;  // This causes unhandled rejection
  },
);

Solution

Simply remove the throw e; line. The original promise is already returned to the caller, so they can handle the rejection appropriately.

Fixes #JS-620

[codecov]

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