ci: use actual `main` branch for components repo unit test job (#46743)
ci: use actual `main` branch for components repo unit test job (#46743)

For the branch rename migration we temporarily had to work
from a forked-off branch. Now that all the migration and cleanup
Is complete, we can switch to the actual new main branch.

This is the last remaining cleanup in the organization as it seems.
PR Close #46743

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