PMM-14441 Update pmm-dump API to support encryption

[maxkondr]

PMM-14441

Link to the Feature Build: Percona-Lab/pmm-submodules#4309

[codecov]

Codecov Report

❌ Patch coverage is 28.12500% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.13%. Comparing base (e21a678) to head (1da74d9).

Files with missing lines	Patch %	Lines
managed/services/management/dump/dump.go	0.00%	12 Missing ⚠️
managed/services/dump/dump.go	35.71%	9 Missing ⚠️
managed/models/dump_reform.go	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5283      +/-   ##
==========================================
+ Coverage   42.10%   42.13%   +0.03%     
==========================================
  Files         410      410              
  Lines       41992    42011      +19     
==========================================
+ Hits        17682    17703      +21     
  Misses      22525    22525              
+ Partials     1785     1783       -2     

Flag	Coverage Δ
admin	34.89% <ø> (ø)
agent	49.24% <ø> (+0.11%)	⬆️
managed	40.62% <28.12%> (+<0.01%)	⬆️
vmproxy	72.09% <ø> (ø)

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