PMM-11231 PMM Updates UI

[matejkubinec]

Adds basic setup and build for the pmm ui.

PMM-11231

Link to the Feature Build: SUBMODULES-3598

• Related PRs:

Grafana:
percona/grafana#723

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.60%. Comparing base (e62cf8c) to head (7660144).

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #2904      +/-   ##
==========================================
- Coverage   44.60%   44.60%   -0.01%     
==========================================
  Files         358      358              
  Lines       35575    35575              
==========================================
- Hits        15869    15867       -2     
- Misses      18088    18092       +4     
+ Partials     1618     1616       -2     

Flag	Coverage Δ
admin	11.47% <ø> (-0.06%)	⬇️
agent	52.74% <ø> (ø)
managed	46.78% <ø> (ø)
vmproxy	66.66% <ø> (ø)

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