ci: reenable CI checks for commit message validation and rebasing on target branch (#44845)
ci: reenable CI checks for commit message validation and rebasing on target branch (#44845)

These checks were temporarily disabled in order to support the angular devtools migration to the angular/angular repo. Now that devtools was merged, we can safely enable these checks again.

PR Close #44845

gkalpak/angular,manekinekko/angular,JiaLiPassion/angular,JiaLiPassion/angular,gkalpak/angular,shairez/angular,angular-indonesia/angular,gnomeontherun/angular,angular/angular,gkalpak/angular,JiaLiPassion/angular,manekinekko/angular,JiaLiPassion/angular,gnomeontherun/angular,shairez/angular,gnomeontherun/angular,angular-indonesia/angular,angular/angular,angular/angular,shairez/angular,gkalpak/angular,gnomeontherun/angular,manekinekko/angular,angular/angular,manekinekko/angular,angular-indonesia/angular,shairez/angular,manekinekko/angular,shairez/angular,manekinekko/angular,angular-indonesia/angular