fix(fake-timers): convert Date to milliseconds before passing to @sinonjs/fake-timers

[Gdhanush-13]

Summary

Fixes #16028

Problem

Since @sinonjs/fake-timers@15.3.0, clock.setSystemTime() only accepts milliseconds (number), throwing TypeError: now should be milliseconds since UNIX epoch when a Date object is passed.

Jest's setSystemTime() API accepts both number | Date, but forwards the value directly to @sinonjs/fake-timers without conversion.

Fix

Convert Date objects to milliseconds via .getTime() before passing to the underlying sinon clock in two places:

1. setSystemTime() - the public API called by users
2. _toSinonFakeTimersConfig() - where the now config option is passed during useFakeTimers()

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commit: 9d5084c