We removed display of the Git SHA in Angular DevTools in https://github.com/angular/angular/pull/55694, so there is no longer a need to stamp release builds in Chrome or Firefox.

I opted to leave a `--config snapshot-build-firefox` option as a no-op which a reader could follow to a comment explaining exactly _why_ we can't stamp Firefox releases. This should hopefully make it less likely that we forget and attempt to re-add this feature in the future only to encounter the same release problems.

PR Close #55717