PMM-12593 Fix grafana renderer for PMM 2.

[BupycHuk]

PMM-12593

Link to the Feature Build: SUBMODULES-3746

If this PR adds or removes or alters one or more API endpoints, please review and add or update the relevant API documents as well:

• API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.06%. Comparing base (7cdb659) to head (868cb40).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3270      +/-   ##
==========================================
- Coverage   43.25%   42.06%   -1.19%     
==========================================
  Files         399      399              
  Lines       41725    50722    +8997     
==========================================
+ Hits        18047    21337    +3290     
- Misses      21669    27374    +5705     
- Partials     2009     2011       +2     

Flag	Coverage Δ
admin	11.55% <ø> (-0.07%)	⬇️
agent	51.98% <ø> (-0.27%)	⬇️
managed	42.78% <ø> (-1.66%)	⬇️
vmproxy	68.57% <ø> (+1.90%)	⬆️

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