PMM-7 Better grafana start/stop handler

[ademidoff]

PMM-7

Link to the Feature Build: SUBMODULES-3778

We are still seeing issues when we try to start grafana during the execution of the dashboards role. Reverting to stop/remove/add (as it was before) will hopefully fix it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.53%. Comparing base (82310f6) to head (a968931).
Report is 2 commits behind head on v3.

Additional details and impacted files

@@           Coverage Diff           @@
##               v3    #3325   +/-   ##
=======================================
  Coverage   43.53%   43.53%           
=======================================
  Files         366      366           
  Lines       44169    44169           
=======================================
  Hits        19231    19231           
  Misses      23252    23252           
  Partials     1686     1686           

Flag	Coverage Δ
admin	11.51% <ø> (ø)
agent	51.96% <ø> (ø)
managed	45.24% <ø> (ø)
vmproxy	68.57% <ø> (ø)

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