Turn on enableSiblingPrerendering in canary

In preparation for the next RC, I set this feature flag to true
everywhere. I did not delete the feature flag yet, in case there are
yet more bugs to be discovered.

I also didn't remove the dynamic feature flag from the Meta builds; I'll
let the Meta folks handle that.

packages/shared/ReactFeatureFlags.js

@@ -145,7 +145,7 @@ export const enableOwnerStacks = __EXPERIMENTAL__;
 
 export const enableShallowPropDiffing = false;
 
-export const enableSiblingPrerendering = false;
+export const enableSiblingPrerendering = true;
 
 /**
  * Enables an expiration time for retry lanes to avoid starvation.

packages/shared/forks/ReactFeatureFlags.native-oss.js

@@ -83,7 +83,7 @@ export const retryLaneExpirationMs = 5000;
 export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 export const useModernStrictMode = true;
-export const enableSiblingPrerendering = false;
+export const enableSiblingPrerendering = true;
 
 // Profiling Only
 export const enableProfilerTimer = __PROFILE__;

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -81,7 +81,7 @@ export const enableInfiniteRenderLoopDetection = false;
 
 export const renameElementSymbol = true;
 export const enableShallowPropDiffing = false;
-export const enableSiblingPrerendering = false;
+export const enableSiblingPrerendering = true;
 
 // TODO: This must be in sync with the main ReactFeatureFlags file because
 // the Test Renderer's value must be the same as the one used by the

packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js

@@ -79,7 +79,7 @@ export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 export const useModernStrictMode = true;
 export const enableFabricCompleteRootInCommitPhase = false;
-export const enableSiblingPrerendering = false;
+export const enableSiblingPrerendering = true;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -92,7 +92,7 @@ export const renameElementSymbol = false;
 export const enableObjectFiber = false;
 export const enableOwnerStacks = false;
 export const enableShallowPropDiffing = false;
-export const enableSiblingPrerendering = false;
+export const enableSiblingPrerendering = true;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);