ci: enable snapshot e2e for renovate PRs
ci: enable snapshot e2e for renovate PRs

snapshots builds are required to be run when the PR is created by renovate. This is because we have renovate jobs that update the snapshots commit SHA and we want to verify that these are green prior to merging them.

Related to: https://github.com/angular/angular-cli/pull/14687

DevIntent/angular-cli,filipesilva/angular-cli,manekinekko/angular-cli,catull/angular-cli,geofffilippi/angular-cli,catull/angular-cli,clydin/angular-cli,hansl/angular-cli,ocombe/angular-cli,angular/angular-cli,filipesilva/angular-cli,beeman/angular-cli,DevIntent/angular-cli,geofffilippi/angular-cli,Brocco/angular-cli,beeman/angular-cli,beeman/angular-cli,DevIntent/angular-cli,angular/angular-cli,Brocco/angular-cli,ocombe/angular-cli,manekinekko/angular-cli,geofffilippi/angular-cli,Brocco/angular-cli,ocombe/angular-cli,hansl/angular-cli,hansl/angular-cli,catull/angular-cli,DevIntent/angular-cli,ocombe/angular-cli,manekinekko/angular-cli,clydin/angular-cli,clydin/angular-cli,clydin/angular-cli,angular/angular-cli,ocombe/angular-cli,catull/angular-cli,geofffilippi/angular-cli,DevIntent/angular-cli,Brocco/angular-cli,Brocco/angular-cli,beeman/angular-cli,filipesilva/angular-cli,angular/angular-cli,hansl/angular-cli,filipesilva/angular-cli