[Test] Complete full test pass for react-native 0.86.0-rc.2

[EmmaYuan1015]

Running tests early enables early detection of breaking changes, performance regressions, and dependency conflicts.
This allows issues to be identified closer to their source, improves diagnosability, and reduces the cost of fixes.
It also provides faster feedback in the development loop, helping maintain build stability and reducing the risk of failures during release.