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#37778
12f177399f