Added AnimatedColor-test.js to cover the negative listener count bug after __detach and removeListener, as requested by @javache.

Overrode addListener, removeListener, and removeAllListeners to mirror AnimatedValueXY architecture and utilize a local listeners map. This handles edge cases like calling removeListener after __detach seamlessly.

## Test Plan
Added a comprehensive regression test suite in `packages/react-native/Libraries/Animated/tests/AnimatedColor-test.js` covering:
- Verifying `_listenerCount` does not drop into negative values after a `__detach()` and subsequent `removeListener()` execution.
- Testing `removeListener` safely acts as a no-op when called after `removeAllListeners()`.
- Ensuring native driver subscriptions are properly initiated and systematically torn down without memory leaks during complex component unmount/re-attach lifecycles.
Tested locally by running:
`yarn jest AnimatedColor-test`

## Changelog
[General] [Fixed] - Prevent negative listener count and native subscription memory leaks in AnimatedColor during detach cascades.

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## Summary:
Fixed an issue in `AnimatedColor.js` where `_listenerCount` could become negative during complex unmount/detach phases. When `__detach()` is invoked on `AnimatedColor`, it triggers `removeAllListeners()` on its underlying channel nodes (r, g, b, a), resetting their counts to 0. Subsequent stale infrastructure cleanups safely invoke `removeListener()`, which blindly decremented the counter to -1, bypassing the `=== 0` check and permanently leaking native subscriptions. 

This PR implements an overridden `removeListener` and `addListener` routine in `AnimatedColor` (mirroring the robust pattern in `AnimatedValueXY`) to act as a defensive shield and guarantee stable listener lifecycles.

## Changelog:
[General] [Fixed] - Prevent negative listener count and native subscription memory leaks in AnimatedColor during detach cascades

## Test Plan:
Added a comprehensive regression test suite in `packages/react-native/Libraries/Animated/tests/AnimatedColor-test.js` covering:
- Verifying `_listenerCount` does not drop into negative values after a `__detach()` and subsequent `removeListener()` execution.
- Testing `removeListener` safely acts as a no-op when called after `removeAllListeners()`.
- Ensuring native driver subscriptions are properly initiated and systematically torn down without memory leaks during complex component unmount/re-attach lifecycles.

Tested locally by running:
`yarn jest AnimatedColor-test`

## Summary:

Fixed an issue in `AnimatedColor.js` where `_listenerCount` could become negative during component unmount, leading to native subscription memory leaks.

When `AnimatedColor.__detach()` is called, it invokes `removeAllListeners()` on its channel nodes (r, g, b, a), resetting their `_listenerCount` to 0. If infrastructure cleanup then calls `removeListener(id)` on those same nodes, the count drops to -1, permanently bypassing the cleanup condition `if (this._listenerCount === 0)` — so `this._updateSubscription?.remove()` never fires.

Fix: Added a `_listeners` map to `AnimatedColor` with overrides for `addListener`, `removeListener`, and `removeAllListeners`. `removeListener` now returns early if the id is not found (already cleaned up by `__detach`), mirroring the pattern used by `AnimatedValueXY`.

## Changelog:

[GENERAL] [FIXED] - Prevent negative listener count in AnimatedColor causing native subscription memory leaks after `__detach()`

## Test Plan:

Added regression tests in `Libraries/Animated/tests/AnimatedColor-test.js`:

- `_listenerCount` does not go negative after `__detach()` + `removeListener()`
- `removeListener` after `removeAllListeners` is a safe no-op
- Native subscription starts correctly for all 4 channels (r/g/b/a)
- Native subscription cleans up correctly when count reaches 0
- No native subscription leak after re-attach cycle

## Summary:

Fixed an issue in AnimatedColor.js where _listenerCount could become 
negative during unmount, causing native subscription memory leaks...

## Changelog:

[GENERAL] [FIXED] - Prevent negative listener count in AnimatedColor 
causing native subscription memory leaks after __detach()

## Test Plan:

Added regression tests in AnimatedColor-test.js covering:
- _listenerCount does not go negative after __detach() + removeListener()
- removeListener after removeAllListeners is a safe no-op
- Native subscription cleanup when count reaches 0

## Summary:
Fixed an issue in AnimatedColor.js where _listenerCount could become negative during complex unmount phases. When __detach() is executed, it invokes removeAllListeners() on underlying channel nodes (r, g, b, a), resetting counts to 0. Subsequent stale infrastructure cleanups invoke removeListener(), which blindly decrements the counter to -1, bypassing the === 0 check and leaking native subscriptions permanently.

## Changelog:
[General] [Fixed] - Prevent negative listener count and native subscription memory leaks in AnimatedColor during detach cascades

## Test Plan:
Added a comprehensive regression test suite in packages/react-native/Libraries/Animated/tests/AnimatedColor-test.js covering:
- Verifying _listenerCount does not drop into negative values after a __detach() and subsequent removeListener() execution.
- Testing removeListener safely acts as a no-op when called after removeAllListeners().
- Ensuring native driver subscriptions are properly initiated and systematically torn down without memory leaks.

Tested locally by running:
yarn jest AnimatedColor-test

## Summary:
Fixed negative listener count bug in AnimatedColor causing memory leaks.

## Changelog:
[GENERAL] [FIXED] - Prevent negative listener count in AnimatedColor after __detach()

## Test Plan:
Added regression tests in AnimatedColor-test.js covering listener count and cleanup.