This PR changes the integration test to load language service the way it would be loaded in the editor.
If the language service is specified in tsconfig, it'd only be loaded for Angular projects.
Specifying it as `globalPlugins` loads it unconditionally whenever tsserver is brought up.
PR Close#30153
This is in preparation for more rigorous testing of external templates, since it'll work differently under the new tsserver plugin model.
PR Close#30128
The current integration test for language service involves piping the
results of one process to another using Unix pipes.
This makes the test hard to debug, and hard to configure.
This commit refactors the integration test to use regular Jasmine
scaffolding.
More importantly, it tests the way the language service will actually
be installed by end users. Users would not have to add
`@angular/language-service` to the plugins section in tsconfig.json
Instead, all they need to do is install the *extension* from
the VS Code Marketplace and Angular Language Service will be loaded
as a global plugin.
PR Close#28168
Keen Yee Liau
Keen Yee Liau
Chuck Jazdzewski