test(compiler): do not use `a` as a content selector
test(compiler): do not use `a` as a content selector

As it might trigger false positive in the RegExp from `_makeScopeMatcher`

closes #20256

JiaLiPassion/angular,hansl/angular,filipesilva/angular,Toxicable/angular,StephenFluin/angular,cironunes/angular,gnomeontherun/angular,snaptech/angular,gdi2290/angular,vikerman/angular,gjungb/angular,mzgol/angular,gnomeontherun/angular,vsavkin/angular,chuckjaz/angular,IgorMinar/angular,IdeaBlade/angular,wKoza/angular,mgechev/angular,jonrimmer/angular,mhevery/angular,wKoza/angular,alexeagle/angular,trshafer/angular,trshafer/angular,matsko/angular,wKoza/angular,LucasSloan/angular,aboveyou00/angular,mlaval/angular,vikerman/angular,heathkit/angular,kara/angular,kara/angular,gkalpak/angular,cironunes/angular,mprobst/angular,Toxicable/angular,brandonroberts/angular,angular-indonesia/angular,sarunint/angular,StephenFluin/angular,vicb/angular,sarunint/angular,StephenFluin/angular,ultrasonicsoft/angular,robwormald/angular,ValtoFrameworks/Angular-2,alexeagle/angular,vsavkin/angular,filipesilva/angular,juristr/angular,petebacondarwin/angular,shairez/angular,jasonaden/angular,angular-indonesia/angular,ultrasonicsoft/angular,cironunes/angular,hansl/angular,mgechev/angular,snaptech/angular,ocombe/angular,Brocco/angular,vsavkin/angular,mprobst/angular,jasonaden/angular,trshafer/angular,pk-karthik/framework-js-angular,filipesilva/angular,petebacondarwin/angular,ocombe/angular,ghetolay/angular,vikerman/angular,ghetolay/angular,mzgol/angular,mhevery/angular,mzgol/angular,StephenFluin/angular,manekinekko/angular,pk-karthik/framework-js-angular,pk-karthik/framework-js-angular,Brocco/angular,mgol/angular,JiaLiPassion/angular,pk-karthik/framework-js-angular,sarunint/angular,petebacondarwin/angular,IdeaBlade/angular,aboveyou00/angular,angular/angular,juristr/angular,gjungb/angular,mzgol/angular,meeroslav/angular,wKoza/angular,alexeagle/angular,shairez/angular,hansl/angular,NathanWalker/angular,trshafer/angular,angular/angular,brandonroberts/angular,NathanWalker/angular,matsko/angular,kara/angular,robwormald/angular,petebacondarwin/angular,Brocco/angular,hansl/angular,vicb/angular,vicb/angular,trshafer/angular,Brocco/angular,snaptech/angular,manekinekko/angular,snaptech/angular,shairez/angular,heathkit/angular,rkirov/angular,LucasSloan/angular,aboveyou00/angular,ValtoFrameworks/Angular-2,petebacondarwin/angular,mprobst/angular,robwormald/angular,hansl/angular,IdeaBlade/angular,ultrasonicsoft/angular,gkalpak/angular,mgol/angular,mhevery/angular,rkirov/angular,ghetolay/angular,vikerman/angular,alxhub/angular,mzgol/angular,wKoza/angular,jasonaden/angular,vikerman/angular,aboveyou00/angular,kegluneq/angular,LucasSloan/angular,filipesilva/angular,meeroslav/angular,gnomeontherun/angular,mgechev/angular,gjungb/angular,jonrimmer/angular,LucasSloan/angular,cironunes/angular,kara/angular,ghetolay/angular,juristr/angular,brandonroberts/angular,alxhub/angular,kegluneq/angular,matsko/angular,vsavkin/angular,IdeaBlade/angular,juristr/angular,robwormald/angular,aboveyou00/angular,gkalpak/angular,jonrimmer/angular,jasonaden/angular,brandonroberts/angular,alxhub/angular,mlaval/angular,gkalpak/angular,ValtoFrameworks/Angular-2,ocombe/angular,NathanWalker/angular,ultrasonicsoft/angular,IgorMinar/angular,vicb/angular,mlaval/angular,gnomeontherun/angular,manekinekko/angular,NathanWalker/angular,kegluneq/angular,jasonaden/angular,brandonroberts/angular,sarunint/angular,jonrimmer/angular,ocombe/angular,sarunint/angular,NathanWalker/angular,juristr/angular,JiaLiPassion/angular,brandonroberts/angular,gdi2290/angular,mzgol/angular,alexeagle/angular,kara/angular,juristr/angular,JiaLiPassion/angular,mgiambalvo/angular,Toxicable/angular,Toxicable/angular,chuckjaz/angular,dsebastien/angular,meeroslav/angular,jasonaden/angular,alxhub/angular,LucasSloan/angular,chuckjaz/angular,manekinekko/angular,trshafer/angular,dsebastien/angular,LucasSloan/angular,vicb/angular,StephenFluin/angular,Brocco/angular,gjungb/angular,jonrimmer/angular,mgol/angular,alxhub/angular,rkirov/angular,meeroslav/angular,snaptech/angular,jonrimmer/angular,mprobst/angular,angular-indonesia/angular,mgechev/angular,Toxicable/angular,kegluneq/angular,heathkit/angular,IgorMinar/angular,mgiambalvo/angular,mhevery/angular,alexeagle/angular,vicb/angular,IgorMinar/angular,mprobst/angular,mgol/angular,rkirov/angular,ValtoFrameworks/Angular-2,rkirov/angular,gdi2290/angular,snaptech/angular,blesh/angular,manekinekko/angular,kegluneq/angular,shairez/angular,mgechev/angular,sarunint/angular,IgorMinar/angular,mgiambalvo/angular,matsko/angular,manekinekko/angular,chuckjaz/angular,ocombe/angular,cironunes/angular,mgiambalvo/angular,pk-karthik/framework-js-angular,NathanWalker/angular,shairez/angular,angular-indonesia/angular,hansl/angular,meeroslav/angular,ocombe/angular,ultrasonicsoft/angular,chuckjaz/angular,ultrasonicsoft/angular,gjungb/angular,heathkit/angular,Brocco/angular,mgiambalvo/angular,angular/angular,mprobst/angular,dsebastien/angular,gdi2290/angular,filipesilva/angular,mhevery/angular,gdi2290/angular,gdi2290/angular,dsebastien/angular,chuckjaz/angular,heathkit/angular,ghetolay/angular,rkirov/angular,IgorMinar/angular,mlaval/angular,Toxicable/angular,blesh/angular,mlaval/angular,vsavkin/angular,mhevery/angular,dsebastien/angular,angular/angular,heathkit/angular,blesh/angular,aboveyou00/angular,blesh/angular,dsebastien/angular,mgol/angular,blesh/angular,vikerman/angular,cironunes/angular,alexeagle/angular,wKoza/angular,petebacondarwin/angular,kegluneq/angular,kara/angular,IdeaBlade/angular,robwormald/angular,robwormald/angular,mgol/angular,ValtoFrameworks/Angular-2,matsko/angular