PMM-14856 Make multiline output of telemetry metrics

[maxkondr]

PMM-14856

Link to the Feature Build: Percona-Lab/pmm-submodules#4281

• Improve docker-compose.yaml

[codecov]

Codecov Report

❌ Patch coverage is 22.72727% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.72%. Comparing base (c8246ba) to head (f56fb9c).

Files with missing lines	Patch %	Lines
managed/services/telemetry/telemetry.go	22.72%	16 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5171      +/-   ##
==========================================
- Coverage   47.76%   47.72%   -0.04%     
==========================================
  Files         410      410              
  Lines       41967    41980      +13     
==========================================
- Hits        20045    20036       -9     
- Misses      19944    19947       +3     
- Partials     1978     1997      +19     

Flag	Coverage Δ
admin	35.80% <ø> (ø)
agent	53.38% <ø> (+0.13%)	⬆️
managed	47.60% <22.72%> (-0.11%)	⬇️
vmproxy	72.09% <ø> (ø)

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