build: use new labeling and branching in merge script (#38428)
build: use new labeling and branching in merge script (#38428)

We introduced a new shared configuration for merge script
labels that follow the proposal of:
https://docs.google.com/document/d/197kVillDwx-RZtSVOBtPb4BBIAw0E9RT3q3v6DZkykU

These label semantics and the branching are set up for the Angular
framework with this commit. The goal is that labeling and merging
is consistent between all Angular projects and that clear rules
are defined for branching. This was previously not the case.

PR Close #38428

blesh/angular,JiaLiPassion/angular,IdeaBlade/angular,angular-indonesia/angular,manekinekko/angular,shairez/angular,blesh/angular,angular/angular,IdeaBlade/angular,alxhub/angular,angular-indonesia/angular,wKoza/angular,shairez/angular,alxhub/angular,mgechev/angular,brandonroberts/angular,blesh/angular,ocombe/angular,manekinekko/angular,shairez/angular,blesh/angular,alxhub/angular,shairez/angular,mgechev/angular,gkalpak/angular,blesh/angular,angular/angular,ocombe/angular,mgechev/angular,angular-indonesia/angular,wKoza/angular,wKoza/angular,brandonroberts/angular,angular-indonesia/angular,brandonroberts/angular,IdeaBlade/angular,ocombe/angular,brandonroberts/angular,gkalpak/angular,alxhub/angular,IdeaBlade/angular,manekinekko/angular,gkalpak/angular,ocombe/angular,wKoza/angular,wKoza/angular,JiaLiPassion/angular,shairez/angular,manekinekko/angular,JiaLiPassion/angular,gkalpak/angular,manekinekko/angular,gnomeontherun/angular,alxhub/angular,ocombe/angular,brandonroberts/angular,brandonroberts/angular,angular/angular,mgechev/angular,wKoza/angular,JiaLiPassion/angular,angular/angular,manekinekko/angular,mgechev/angular,IdeaBlade/angular,ocombe/angular,gnomeontherun/angular,gnomeontherun/angular,gnomeontherun/angular