Fix error logs/message for loki-op 6

[jotak]

We're seeing a lot of errors with "no message found". This is because with Loki operator 6, the json of the error has changed. We need now to look at the "error" field.

Also add more debug logs

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from jotak. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 55.99%. Comparing base (693d236) to head (9c2ded5).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/handler/loki.go	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #617      +/-   ##
==========================================
- Coverage   56.01%   55.99%   -0.03%     
==========================================
  Files         193      193              
  Lines        9479     9487       +8     
  Branches     1213     1214       +1     
==========================================
+ Hits         5310     5312       +2     
- Misses       3792     3798       +6     
  Partials      377      377              

Flag	Coverage Δ
uitests	57.70% <ø> (-0.03%)	⬇️
unittests	51.30% <28.57%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/handler/loki.go	40.00% <28.57%> (ø)

... and 3 files with indirect coverage changes