test(AnimatedMock): make mocks .start callback async + implemented on all animations

[Michael-M-Judd]

Summary

When mocked Animated using the AnimatedMock, I noticed a few things that were off with the mocks that weren't happening with real code:

1. The mocks call the callback from .start() synchronously. I've changed this to make it async so that it's more like the real Animated behaviour
2. The mocks for .parallel, .decay, .stagger, .sequence, and .loop all used the emptyAnimation object which doesn't implement the .start(cb) callback like timing/spring do.

This should also fix #25615

Changelog

[General] [Fixed] - AnimatedMock .parallel, .stagger, .sequence, .loop now correctly call the callback passed to .start
[General] [Fixed] - All AnimatedMock .start callback methods are now called async instead of synchronously to better simulate the production environment

Test Plan

• Added new tests to assert that they work as expected
• Also ran these changes against our own codebase and fixed a few issues 🎉

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[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 91cac20

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	9,190,278	+22
android	hermes	armeabi-v7a	8,715,903	+13
android	hermes	x86	9,632,310	+19
android	hermes	x86_64	9,599,899	+13
android	jsc	arm64-v8a	10,826,329	+10
android	jsc	armeabi-v7a	9,743,236	+16
android	jsc	x86	10,863,757	+12
android	jsc	x86_64	11,472,862	+13

Base commit: 91cac20

[lunaleaps]

Why do we call runAllTimers twice? Do we need to call it in the test if its part of itCallsStartCallback?

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