fix(@angular/cli): use require for @angular/core check

[filipesilva]

This should help with linked node_module scenarios.

Fix #3864
Should help with #7097

[filipesilva]

@intellix can you check if this helps in your yarn workspaces repro?

[intellix]

Works :)

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}