fix(language-service): non-existent module format in package output (#37623)

The language-service package currently sets the `module` `package.json`
property and refers to a folder called `fesm5`. The language-service
though does not build with `ng_package` so this folder never existed.
Now with APF v10, ng package would not generate this folder either.

We should just remove the property as the primary entry-point is
the UMD bundle resolved through `main`. There is no module flavour
exposed to the NPM package as `pkg_npm` uses the named AMD module
devmode output that doesn't work for `module`.

PR Close #37623

packages/language-service/package.json

@@ -3,7 +3,6 @@
   "version": "0.0.0-PLACEHOLDER",
   "description": "Angular - language services",
   "main": "./bundles/language-service.umd.js",
-  "module": "./fesm5/language-service.js",
   "typings": "./index.d.ts",
   "author": "angular",
   "license": "MIT",