Re-enable two previously-skipped LayoutAnimation stress tests (#56883)

Summary:
Pull Request resolved: #56883

Two parameterized `LayoutAnimationTest` stress tests have been marked `GTEST_SKIP()` since early 2024, when the default Yoga `position` was switched from `absolute` to `relative`. The skip was added as a temporary measure while the test expectations diverged from the new default.

The underlying issue appears to have been resolved by subsequent work on the layout differ / mounting pipeline.

Changelog: [Internal]

Differential Revision: D105661336

fbshipit-source-id: 7b0a89c6e7b24b903a6a792d8e82b3aee8d94bd6

Author: fkgozali

packages/react-native/ReactCommon/react/renderer/animations/tests/LayoutAnimationTest.cpp

@@ -493,7 +493,6 @@ TEST(
 TEST(
     LayoutAnimationTest,
     stableSmallerTreeFewRepeatsFewStages_Overlapping_ManyConflicts_597132284) {
-  GTEST_SKIP();
   testShadowNodeTreeLifeCycleLayoutAnimations(
       /* seed */ 597132284,
       /* size */ 128,
@@ -514,7 +513,6 @@ TEST(
 TEST(
     LayoutAnimationTest,
     stableBiggerTreeFewRepeatsManyStages_Overlapping_ManyConflicts_2029343357) {
-  GTEST_SKIP();
   testShadowNodeTreeLifeCycleLayoutAnimations(
       /* seed */ 2029343357,
       /* size */ 512,