refactor(@angular/build): cleanup persistent JS transformer cache on plugin dispose

Close and allow the persistent JS transformer cache to cleanup open
lock files when the Angular compiler plugin is disposed. While this is
not strictly necessary, it does help prevent extra cache lock files from
being retained after build completion.

(cherry picked from commit 7a539ab)

Author: clydin

packages/angular/build/src/tools/esbuild/angular/compiler-plugin.ts

@@ -63,10 +63,10 @@ export function createCompilerPlugin(
       const preserveSymlinks = build.initialOptions.preserveSymlinks;
 
       // Initialize a worker pool for JavaScript transformations
-      let cacheStore;
+      let cacheStore: LmbdCacheStore | undefined;
       if (pluginOptions.sourceFileCache?.persistentCachePath) {
         cacheStore = new LmbdCacheStore(
-          pluginOptions.sourceFileCache.persistentCachePath + '/angular-compiler.db',
+          path.join(pluginOptions.sourceFileCache.persistentCachePath, 'angular-compiler.db'),
         );
       }
       const javascriptTransformer = new JavaScriptTransformer(
@@ -446,6 +446,7 @@ export function createCompilerPlugin(
         sharedTSCompilationState?.dispose();
         void stylesheetBundler.dispose();
         void compilation.close?.();
+        void cacheStore?.close();
       });
 
       /**