[Monorepo] Remove external repo path support

Is there an existing issue for this?

[X] I have searched the existing issues

What happened?

In order not to conflict git history, I suggest support to adding external and full paths be removed. Again, for merging support, can this be fixed to prevent the external/full path issue.

Expected Behavior or Solution

Expects the path config to be required and used in all sub repo config eg:

repoA:
  url: ./../somewhere/repoA
  path: packages/repoA

Steps To Reproduce

No response

Additional context