Confusing error message when using on.repository

[malomarrec]

Current state

When using on.repository, if is not a valid repository path

on:
  - repository: repo-name

Batch Changes returns:

Error:
   resolving repositories: resolving "r:repo-name": no repository found

This error is not very clear or helpful:

• it looks like a search error, that tells the user that the repo-name does not exist
• it does not point users to the resolution (repository should be a codehost.com/repo-name path)

Proposed state

Improve the error handling to allow users to trace down the issue.

[LawnGnome]

We think this is src-cli only.

[adeola-ak]

I believe SSBC error for this operation may also not be clear enough
Resolving "r:sourcegraph": repo not found: name="sourcegraph"

Think I will fix both to be the same