[DPE-4062] Improve displayed error message if charm was deployed without --trust flag

[lucasgameiroborges]

Issue

K8s charms that create resources in a RBAC enabled environment need to be deployed with the --trust flag, otherwise they don't work. If a user deploys PGB k8s charm without that flag, there is no clear message indicating the issue.

Solution

• Adds a integration test to see if charm enters blocked status if not deployed with --trust.
• Adds a check in K8s resource creation functions to catch for 403 forbidden errors. ==> This check was added everywhere lightkube.Client().get is used. Maybe overkill, but better safe than sorry, I think?
• Adds unit tests

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 70.63%. Comparing base (c36b92b) to head (e01dd08).

Files	Patch %	Lines
src/charm.py	80.00%	1 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #319      +/-   ##
==========================================
+ Coverage   70.35%   70.63%   +0.28%     
==========================================
  Files           8        8              
  Lines        1167     1192      +25     
  Branches      213      218       +5     
==========================================
+ Hits          821      842      +21     
+ Misses        269      268       -1     
- Partials       77       82       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[dragomirp]

Please add unit tests for the changes. We should try to keep Codecov happy.

[lucasgameiroborges]

Yep I will, I'm still not done with the changes tho. It's still in draft!! :P You are too fast!

[marceloneppel]

LGTM!