PMM-14837 Migrate grafana-dashboards to the monorepo

[ademidoff]

PMM-14837

Link to the Feature Build: SUBMODULES-4277

Note

The failing Dashboards / Check was expected and the Frontend team wants to apply the necessary fixes in a separate ticket after we merge this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.45%. Comparing base (94a8535) to head (29b79e0).
⚠️ Report is 1 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5150      +/-   ##
==========================================
- Coverage   47.70%   47.45%   -0.26%     
==========================================
  Files         410      540     +130     
  Lines       41967    44311    +2344     
  Branches        0      590     +590     
==========================================
+ Hits        20022    21029    +1007     
- Misses      19964    21298    +1334     
- Partials     1981     1984       +3     

Flag	Coverage Δ
admin	35.80% <ø> (ø)
agent	53.36% <ø> (+0.36%)	⬆️
managed	47.71% <ø> (ø)
unittests	41.38% <ø> (?)
vmproxy	72.09% <ø> (ø)

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