feat(language-service): add script to rebuild, refresh Angular dist (#32515)

The Language Service integration tests should reinstall the Angular
distribution every time it is built. Adds a `yarn build-dist`
convinience script so building the distribution doesn't have to
happen on the repo root. This new script also refreshes the installed
modules. Building is expesnive, so it is not bundled with testing
scripts.

PR Close #32515

integration/language_service_plugin/README.md

@@ -7,9 +7,9 @@ To use the tests:
 
 - Use `yarn install` to install all dependencies in this directory and in the Angular repo root
     directory.
-- From the Angular repo root directory, build Angular in the `dist/packages-dist` folder with
-    `./scripts/build-packages-dist.sh`.
-- In this directory, run the tests with `yarn test`.
+- Build an Angular distribution with `yarn build-dist`. This needs to be done after changes to
+    Angular, but not after changes to integration tests. This is an expensive build.
+- In this directory, run the integration tests with `yarn test`.
 
 ## Update golden files
 

integration/language_service_plugin/package.json

@@ -12,6 +12,7 @@
   },
   "scripts": {
     "build": "tsc -p tsconfig.json",
+    "build-dist": "../../scripts/build-packages-dist.sh && yarn install --check-files",
     "cleanup": "rm -rf ti-*.log tsserver.log",
     "golden": "yarn build && node generate.js",
     "test": "yarn cleanup && yarn build && jasmine test.js"