Promote inlineUseMemo to stable (remove flag)

Per title, this feature flag is enabled everywhere and is clearly stable, let's 
promote to stable and remove the flag to simplify.

compiler/apps/playground/components/Editor/index.tsx

@@ -114,7 +114,6 @@ function parsePragma(pragma: string) {
   let disableAllMemoization = false;
   let validateRefAccessDuringRender = true;
   let enableEmitFreeze = null;
-  let inlineUseMemo = true;
   let validateHooksUsage = true;
   let validateFrozenLambdas = true;
   let assertValidMutableRanges = true;
@@ -137,9 +136,6 @@ function parsePragma(pragma: string) {
       importSpecifierName: "makeReadOnly",
     };
   }
-  if (pragma.includes("@inlineUseMemo false")) {
-    inlineUseMemo = false;
-  }
   if (pragma.includes("@validateHooksUsage false")) {
     validateHooksUsage = false;
   }
@@ -153,7 +149,6 @@ function parsePragma(pragma: string) {
   return {
     enableAssumeHooksFollowRulesOfReact,
     disableAllMemoization,
-    inlineUseMemo,
     memoizeJsxElements,
     validateHooksUsage,
     validateRefAccessDuringRender,

compiler/packages/babel-plugin-react-forget/src/Entrypoint/Pipeline.ts

@@ -106,10 +106,8 @@ function* runWithEnvironment(
   pruneMaybeThrows(hir);
   yield log({ kind: "hir", name: "PruneMaybeThrows", value: hir });
 
-  if (env.config.inlineUseMemo) {
-    inlineUseMemo(hir);
-    yield log({ kind: "hir", name: "RewriteUseMemo", value: hir });
-  }
+  inlineUseMemo(hir);
+  yield log({ kind: "hir", name: "RewriteUseMemo", value: hir });
 
   mergeConsecutiveBlocks(hir);
   yield log({ kind: "hir", name: "MergeConsecutiveBlocks", value: hir });

compiler/packages/babel-plugin-react-forget/src/HIR/Environment.ts

@@ -132,14 +132,6 @@ export type EnvironmentConfig = {
    */
   validateNoSetStateInRender: boolean;
 
-  /**
-   * Enable inlining of `useMemo()` function expressions so that they can be more optimally
-   * compiled.
-   *
-   * Defaults to false
-   */
-  inlineUseMemo: boolean;
-
   /**
    * When enabled, the compiler assumes that hooks follow the Rules of React:
    * - Hooks may memoize computation based on any of their parameters, thus
@@ -224,7 +216,6 @@ const DEFAULT_ENVIRONMENT_CONFIG: Readonly<EnvironmentConfig> = {
   customHooks: null,
 
   memoizeJsxElements: true,
-  inlineUseMemo: true,
   validateHooksUsage: true,
 
   assertValidMutableRanges: false,