[cleanup] remove unused values from ReactFeatureFlags.www-dynamic (#25575)

These values are never imported into `ReactFeatureFlags.www.js`, so
they're unused:
- `allowConcurrentByDefault`
- `consoleManagedByDevToolsDuringStrictMode`

These values are never set in the WWW module
(https://fburl.com/code/dsb2ohv8), so they're always `undefined` on www:
- `createRootStrictEffectsByDefault`
- `enableClientRenderFallbackOnTextMismatch`

packages/shared/forks/ReactFeatureFlags.www-dynamic.js

@@ -25,9 +25,7 @@ export const disableSchedulerTimeoutInWorkLoop = __VARIANT__;
 export const enableLazyContextPropagation = __VARIANT__;
 export const enableSyncDefaultUpdates = __VARIANT__;
 export const enableUnifiedSyncLane = __VARIANT__;
-export const consoleManagedByDevToolsDuringStrictMode = __VARIANT__;
 export const enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay = __VARIANT__;
-export const enableClientRenderFallbackOnTextMismatch = __VARIANT__;
 export const enableTransitionTracing = __VARIANT__;
 // Enable this flag to help with concurrent mode debugging.
 // It logs information to the console about React scheduling, rendering, and commit phases.
@@ -57,7 +55,5 @@ export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
 export const enableTrustedTypesIntegration = false;
 export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
 export const disableNativeComponentFrames = false;
-export const createRootStrictEffectsByDefault = false;
-export const allowConcurrentByDefault = true;
 // You probably *don't* want to add more hardcoded ones.
 // Instead, try to add them above with the __VARIANT__ value.

packages/shared/forks/ReactFeatureFlags.www.js

@@ -25,7 +25,6 @@ export const {
   deferRenderPhaseUpdateToNextBatch,
   enableDebugTracing,
   skipUnmountedBoundaries,
-  createRootStrictEffectsByDefault,
   enableUseRefAccessWarning,
   disableNativeComponentFrames,
   disableSchedulerTimeoutInWorkLoop,
@@ -33,7 +32,6 @@ export const {
   enableSyncDefaultUpdates,
   enableUnifiedSyncLane,
   enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay,
-  enableClientRenderFallbackOnTextMismatch,
   enableTransitionTracing,
 } = dynamicFeatureFlags;
 
@@ -48,6 +46,7 @@ export const enableProfilerNestedUpdateScheduledHook: boolean =
   __PROFILE__ && dynamicFeatureFlags.enableProfilerNestedUpdateScheduledHook;
 export const enableUpdaterTracking = __PROFILE__;
 
+export const createRootStrictEffectsByDefault = false;
 export const enableSuspenseAvoidThisFallback = true;
 export const enableSuspenseAvoidThisFallbackFizz = false;
 export const enableCPUSuspense = true;
@@ -56,6 +55,7 @@ export const enableUseHook = true;
 export const enableUseMemoCacheHook = true;
 export const enableUseEffectEventHook = true;
 export const enableHostSingletons = true;
+export const enableClientRenderFallbackOnTextMismatch = false;
 
 // Logs additional User Timing API marks for use with an experimental profiling tool.
 export const enableSchedulingProfiler: boolean =