Fix ownerStackLimit feature gating for tests (#32726)

https://github.com/facebook/react/pull/32529 added a dynamic flag for
this, but that breaks tests since the flags are not defined everywhere.

However, this is a static value and the flag is only for supporting
existing tests. So we can override it in the test config, and make it
static at built time instead.

scripts/jest/setupTests.www.js

@@ -17,6 +17,9 @@ jest.mock('shared/ReactFeatureFlags', () => {
   // we remove the flag.
   actual.disableClientCache = __VARIANT__;
 
+  // Some value that doesn't impact existing tests
+  actual.ownerStackLimit = __VARIANT__ ? 500 : 1e4;
+
   return actual;
 });
 

scripts/jest/setupTests.xplat.js

@@ -22,6 +22,9 @@ jest.mock('shared/ReactFeatureFlags', () => {
   actual.enableScopeAPI = true;
   actual.enableTaint = false;
 
+  // Some value that doesn't impact existing tests
+  actual.ownerStackLimit = __VARIANT__ ? 500 : 1e4;
+
   return actual;
 });