PMM-15010 Redact sensitive info in log streams

[maxkondr]

PMM-15010

Link to the Feature Build: Percona-Lab/pmm-submodules#4343

• more places were identified where sensitive data(credentials) were printed into log stream
• extend tests

[codecov]

Codecov Report

❌ Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.13%. Comparing base (99a2c99) to head (96611c9).
⚠️ Report is 1 commits behind head on v3.

Files with missing lines	Patch %	Lines
managed/utils/interceptors/interceptors.go	0.00%	24 Missing ⚠️
managed/services/agents/connection_checker.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5324      +/-   ##
==========================================
- Coverage   42.20%   42.13%   -0.07%     
==========================================
  Files         410      410              
  Lines       41995    42010      +15     
==========================================
- Hits        17723    17700      -23     
- Misses      22488    22523      +35     
- Partials     1784     1787       +3     

Flag	Coverage Δ
admin	34.89% <ø> (ø)
agent	49.02% <ø> (-0.21%)	⬇️
managed	40.68% <0.00%> (-0.04%)	⬇️
vmproxy	72.41% <ø> (ø)

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