chore: remove juju/errors (#6681)

[ti-chi-bot]

This is an automated cherry-pick of #6681

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.48%. Comparing base (c23a794) to head (9ba37c5).
⚠️ Report is 73 commits behind head on release-1.6.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.6    #6682      +/-   ##
===============================================
+ Coverage        57.20%   57.48%   +0.28%     
===============================================
  Files              259      263       +4     
  Lines            33233    38186    +4953     
===============================================
+ Hits             19010    21951    +2941     
- Misses           12290    14167    +1877     
- Partials          1933     2068     +135     

Flag	Coverage Δ
unittest	57.48% <ø> (+0.28%)	⬆️

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[csuzhangxc]

/run-pull-e2e-kind

[csuzhangxc]

/run-pull-e2e-kind-across-kubernetes

[csuzhangxc]

/run-pull-e2e-kind