[ANGLE] Re-enable ANGLE's "force context check" build flag (#37055)
[ANGLE] Re-enable ANGLE's "force context check" build flag (#37055)

In [angle@54dfb62](https://github.com/google/angle/commit/54dfb62c24ddd0fb825c874ad00ddbbd769fa2bc), ANGLE made the "force context check" flag off by default [to improve performance](https://chromium-review.googlesource.com/c/angle/angle/+/2809855). Disabling this flag uncovered several bugs in ANGLE's D3D11 renderer that can cause [Flutter 3.3.0+ to crash](https://github.com/flutter/flutter/issues/110311). This change re-enables the "force context check" flag, bringing Flutter back to the last known good state used by Flutter 3.0.5 and earlier.

Fixes https://github.com/flutter/flutter/issues/110311
flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine,flutter/engine