Put duplicate plugin location in error message

[AlanCoding]

SUMMARY

I was trying to adjust some things in our testing suite, and I was getting very frustrated due to this error message, and the lack of actionable information that it gives me.

Before:

E               ValueError: a ManagedCredentialType with namespace=controller is already defined in /awx_devel/awx/main/models/credential.py

You say that the controller credential type is already defined... but why are you telling me this? I don't have prior context, why does it matter that it is already defined? I would hope that it should be defined, yes. That definition sounds like a perfectly good way to define it. Why is this a problem? I see there is a hint that we have a conflicting definition... I know nothing about this other definition.

After:

E               ValueError: a ManagedCredentialType with namespace=controller was defined in awx_plugins.credentials.plugins:controller, but also defined in /awx_devel/awx/main/models/credential.py

ISSUE TYPE

• Bug, Docs Fix or other nominal change

COMPONENT NAME

• API

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.23%. Comparing base (a19e1ba) to head (76b9fcc).
Report is 15 commits behind head on devel.

✅ All tests successful. No failed tests found.

❌ Your project status has failed because the head coverage (75.23%) is below the target coverage (100.00%). You can increase the head coverage or adjust the target coverage.