ci: set Node.js v14 as the default version for jobs
ci: set Node.js v14 as the default version for jobs

All PR jobs will use Node.js v14.
A Node.js v12 E2E job is now run on release branches.

ocombe/angular-cli,geofffilippi/angular-cli,angular/angular-cli,clydin/angular-cli,Brocco/angular-cli,Brocco/angular-cli,catull/angular-cli,geofffilippi/angular-cli,clydin/angular-cli,clydin/angular-cli,ocombe/angular-cli,clydin/angular-cli,angular/angular-cli,geofffilippi/angular-cli,catull/angular-cli,Brocco/angular-cli,angular/angular-cli,ocombe/angular-cli,ocombe/angular-cli,Brocco/angular-cli,Brocco/angular-cli,catull/angular-cli,angular/angular-cli,geofffilippi/angular-cli,catull/angular-cli,ocombe/angular-cli