Fix _getEntryPointAbsolutePath conflating disk paths with URL pathnames (#1708)

Summary:

D102004228 added `[metro-project]`/`[metro-watchFolders]` virtual URL pathname resolution to `_getEntryPointAbsolutePath`, but this method doesn't take URL pathnames - it takes actual filesystem paths (ultimately from Metro's API / CLI).

The fix removes virtual prefix resolution from `_getEntryPointAbsolutePath`, making it a plain `path.resolve(serverRootDir, entryFile)` call, consistent with `buildGraph` which already treats the entry file as a plain disk path.

Changelog:

* **[Fix]:** Remove erroneous `[metro-project]` and `[metro-watchFolders]` resolution from API and CLI

Reviewed By: huntie

Differential Revision: D104415558

Author: motiz88

packages/metro/src/Server.js

@@ -1690,10 +1690,7 @@ export default class Server {
   };
 
   _getEntryPointAbsolutePath(entryFile: string): string {
-    return (
-      this._routeMap.filePathOfUrlDecodedPathname(entryFile) ??
-      path.resolve(this._routeMap.serverRootDir, entryFile)
-    );
+    return path.resolve(this._routeMap.serverRootDir, entryFile);
   }
 
   // Wait for the server to finish initializing.

packages/metro/src/integration_tests/__tests__/build-test.js

@@ -118,21 +118,17 @@ test('allows specifying paths to save bundle and maps', async () => {
   );
 });
 
-// $FlowFixMe[prop-missing] - test.failing is not in Flow's Jest types
-test.failing(
-  'builds a bundle from a file in a directory literally named [metro-project]',
-  async () => {
-    const config = await Metro.loadConfig({
-      config: require.resolve('../metro.config.js'),
-    });
+test('builds a bundle from a file in a directory literally named [metro-project]', async () => {
+  const config = await Metro.loadConfig({
+    config: require.resolve('../metro.config.js'),
+  });
 
-    const result = await Metro.runBuild(config, {
-      entry: './[metro-project]/LiteralDir.js',
-    });
+  const result = await Metro.runBuild(config, {
+    entry: './[metro-project]/LiteralDir.js',
+  });
 
-    expect(execBundle(result.code)).toBe('from-literal-dir');
-  },
-);
+  expect(execBundle(result.code)).toBe('from-literal-dir');
+});
 
 // $FlowFixMe[prop-missing] - test.failing is not in Flow's Jest types
 test.failing(