fix(@angular/cli): display a more detailed error message when workspace cannot be loaded
fix(@angular/cli): display a more detailed error message when workspace cannot be loaded

Closes #15023, closes #10757, closes #14933 and closes #11204

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