PMM-13483 Refactor pmm-update

[ademidoff]

PMM-13483

Link to the Feature Build: SUBMODULES-3775

Note: pmm-managed tests will stop failing once we merge this PR to v3.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.51%. Comparing base (b7885f1) to head (43f2330).
Report is 1 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #3317      +/-   ##
==========================================
- Coverage   43.57%   43.51%   -0.06%     
==========================================
  Files         366      366              
  Lines       44238    44168      -70     
==========================================
- Hits        19275    19219      -56     
+ Misses      23275    23264      -11     
+ Partials     1688     1685       -3     

Flag	Coverage Δ
admin	11.51% <ø> (ø)
agent	51.83% <ø> (-0.13%)	⬇️
vmproxy	68.57% <ø> (ø)

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[JiriCtvrtka]

@ademidoff could you update test in managed to match new name?

[ademidoff]

@ademidoff could you update test in managed to match new name?

Sure, that's what I did - it expects pmm-init.log, but it gets pmm-update-perform-init.log, which is the old name coming from 3-dev-latest image. As I mentioned above, once we merge this PR, the error will be gone.

[BupycHuk]

probably we need analog of this doc for new update process.