build: remove unused "test.sh" leftover code in language-service (#28352)
build: remove unused "test.sh" leftover code in language-service (#28352)

Since we recently removed the `test.sh` script, and now run all
tests with Bazel, we can remove the unused logic that makes language-service
tests pass in non-Bazel.

This cleans up the tests, and also makes it easier to write tests
without worrying about two ways of the Angular package output
(Bazel `ng_package` rules vs. old `build.sh` logic of building)

PR Close #28352

IgorMinar/angular,blesh/angular,manekinekko/angular,juristr/angular,manekinekko/angular,gnomeontherun/angular,alxhub/angular,snaptech/angular,gdi2290/angular,sarunint/angular,IdeaBlade/angular,vikerman/angular,alexeagle/angular,mhevery/angular,juristr/angular,StephenFluin/angular,StephenFluin/angular,sarunint/angular,Toxicable/angular,blesh/angular,gnomeontherun/angular,alxhub/angular,angular-indonesia/angular,gdi2290/angular,JiaLiPassion/angular,wKoza/angular,alexeagle/angular,shairez/angular,ocombe/angular,blesh/angular,gdi2290/angular,snaptech/angular,vikerman/angular,filipesilva/angular,hansl/angular,jasonaden/angular,hansl/angular,mprobst/angular,ocombe/angular,mprobst/angular,hansl/angular,brandonroberts/angular,blesh/angular,shairez/angular,petebacondarwin/angular,mprobst/angular,matsko/angular,IdeaBlade/angular,angular/angular,petebacondarwin/angular,hansl/angular,jasonaden/angular,manekinekko/angular,mhevery/angular,vikerman/angular,hansl/angular,petebacondarwin/angular,petebacondarwin/angular,mlaval/angular,ocombe/angular,hansl/angular,angular-indonesia/angular,mprobst/angular,alexeagle/angular,Brocco/angular,mprobst/angular,juristr/angular,brandonroberts/angular,StephenFluin/angular,sarunint/angular,matsko/angular,gkalpak/angular,jasonaden/angular,alxhub/angular,snaptech/angular,snaptech/angular,vikerman/angular,wKoza/angular,StephenFluin/angular,wKoza/angular,StephenFluin/angular,mgechev/angular,gkalpak/angular,alxhub/angular,brandonroberts/angular,filipesilva/angular,gnomeontherun/angular,angular-indonesia/angular,Toxicable/angular,Brocco/angular,shairez/angular,Brocco/angular,manekinekko/angular,shairez/angular,angular/angular,matsko/angular,juristr/angular,manekinekko/angular,alxhub/angular,ocombe/angular,petebacondarwin/angular,mlaval/angular,mgechev/angular,juristr/angular,filipesilva/angular,alexeagle/angular,JiaLiPassion/angular,snaptech/angular,Toxicable/angular,Brocco/angular,filipesilva/angular,wKoza/angular,IgorMinar/angular,JiaLiPassion/angular,mgechev/angular,gkalpak/angular,sarunint/angular,brandonroberts/angular,mhevery/angular,Brocco/angular,filipesilva/angular,snaptech/angular,IgorMinar/angular,sarunint/angular,mprobst/angular,manekinekko/angular,Toxicable/angular,ocombe/angular,shairez/angular,brandonroberts/angular,mhevery/angular,mgechev/angular,mhevery/angular,jasonaden/angular,gkalpak/angular,wKoza/angular,Brocco/angular,JiaLiPassion/angular,IgorMinar/angular,jasonaden/angular,gdi2290/angular,petebacondarwin/angular,mhevery/angular,angular/angular,vikerman/angular,IgorMinar/angular,blesh/angular,IdeaBlade/angular,Toxicable/angular,matsko/angular,sarunint/angular,mgechev/angular,wKoza/angular,gnomeontherun/angular,gdi2290/angular,ocombe/angular,vikerman/angular,angular-indonesia/angular,mlaval/angular,jasonaden/angular,matsko/angular,angular/angular,mlaval/angular,mlaval/angular,Toxicable/angular,IdeaBlade/angular,IgorMinar/angular,alexeagle/angular,brandonroberts/angular,gdi2290/angular,juristr/angular,alexeagle/angular,IdeaBlade/angular