fix(dev-infra): do not run the `lock-closed` GitHub action on forks (#36000)
fix(dev-infra): do not run the `lock-closed` GitHub action on forks (#36000)

Previously, the `lock-closed` GitHub action, which runs daily and locks
closed inactive issues, was run on each fork of the `angular/angular`
repo. While the action is a [no-op on forks][1], it make still fail from
time to time, generating a confusing notification e-mail for the fork
owner.

This commit configures the `lock-closed` action to only run on the main
`angular/angular` repository (using the method suggested [here][2]).

[1]: https://github.com/angular/dev-infra/blob/13b25d383/github-actions/lock-closed/src/main.ts#L117
[2]: https://github.community/t5/GitHub-Actions/Do-not-run-cron-workflows-in-forks/td-p/46756

PR Close #36000

JiaLiPassion/angular,StephenFluin/angular,StephenFluin/angular,gnomeontherun/angular,angular/angular,angular-indonesia/angular,brandonroberts/angular,blesh/angular,manekinekko/angular,manekinekko/angular,angular-indonesia/angular,Toxicable/angular,manekinekko/angular,snaptech/angular,matsko/angular,ocombe/angular,manekinekko/angular,shairez/angular,wKoza/angular,angular/angular,blesh/angular,angular/angular,ocombe/angular,alxhub/angular,gdi2290/angular,filipesilva/angular,IdeaBlade/angular,brandonroberts/angular,IdeaBlade/angular,manekinekko/angular,gkalpak/angular,gkalpak/angular,mgechev/angular,brandonroberts/angular,JiaLiPassion/angular,blesh/angular,alxhub/angular,matsko/angular,wKoza/angular,ocombe/angular,gdi2290/angular,ocombe/angular,matsko/angular,matsko/angular,snaptech/angular,snaptech/angular,JiaLiPassion/angular,Toxicable/angular,matsko/angular,IdeaBlade/angular,gkalpak/angular,filipesilva/angular,angular/angular,snaptech/angular,wKoza/angular,manekinekko/angular,Toxicable/angular,mgechev/angular,alxhub/angular,snaptech/angular,gnomeontherun/angular,StephenFluin/angular,gkalpak/angular,shairez/angular,brandonroberts/angular,Toxicable/angular,IdeaBlade/angular,gdi2290/angular,angular-indonesia/angular,Toxicable/angular,JiaLiPassion/angular,shairez/angular,snaptech/angular,gdi2290/angular,filipesilva/angular,ocombe/angular,mgechev/angular,IdeaBlade/angular,alxhub/angular,StephenFluin/angular,gdi2290/angular,shairez/angular,ocombe/angular,angular-indonesia/angular,blesh/angular,mgechev/angular,filipesilva/angular,alxhub/angular,gnomeontherun/angular,brandonroberts/angular,mgechev/angular,blesh/angular,shairez/angular,filipesilva/angular,gdi2290/angular,StephenFluin/angular,brandonroberts/angular,Toxicable/angular,gnomeontherun/angular,wKoza/angular,wKoza/angular,wKoza/angular