fix(@angular/build): allow library outputPath within project root

Remove the upfront check restricting `outputPath` from being within or
containing the project root in the library builder. This is needed for
Bazel builds where the output directory (`bazel-out/...`) is located
under the workspace/project root, and matches the behavior of the
application builder which relies on `deleteOutputDir` when cleaning.

Author: alan-agius4

packages/angular/build/src/builders/library/options.ts

@@ -14,7 +14,6 @@ import { normalizeAssetPatterns } from '../../utils';
 import { supportColor } from '../../utils/color';
 import { assertIsError } from '../../utils/error';
 import { normalizeCacheOptions } from '../../utils/normalize-cache';
-import { isSubDirectory } from '../../utils/path';
 import {
   generateSearchDirectories,
   getTailwindConfig,
@@ -34,19 +33,6 @@ export async function normalizeLibraryOptions(
   const projectMetadata = await context.getProjectMetadata(projectName);
   const { projectRoot, projectSourceRoot } = getProjectRootPaths(workspaceRoot, projectMetadata);
 
-  const outputPath = options.outputPath ?? path.join(workspaceRoot, 'dist', projectName);
-  const resolvedOutputPath = path.resolve(workspaceRoot, outputPath);
-  if (
-    resolvedOutputPath === projectRoot ||
-    isSubDirectory(resolvedOutputPath, projectRoot) ||
-    isSubDirectory(projectRoot, resolvedOutputPath)
-  ) {
-    throw new Error(
-      `The 'outputPath' (${resolvedOutputPath}) cannot be the project root, ` +
-        `contain the project root, or be located within the project root.`,
-    );
-  }
-
   const {
     tsConfig,
     assets: rawAssets,
@@ -127,7 +113,6 @@ export async function normalizeLibraryOptions(
   );
 
   const cacheOptions = normalizeCacheOptions(projectMetadata, workspaceRoot);
-
   const styleIncludePaths = (stylePreprocessorOptions?.includePaths ?? []).map((p: string) =>
     path.resolve(workspaceRoot, p),
   );
@@ -143,7 +128,7 @@ export async function normalizeLibraryOptions(
     projectRoot,
     packageName,
     packageJson,
-    outputPath: resolvedOutputPath,
+    outputPath: path.resolve(workspaceRoot, options.outputPath ?? path.join('dist', projectName)),
     deleteOutputPath,
     packageJsonPath,
     tsConfigPath: resolvedTsConfigPath,