PMM Seperate histogram from diagnostic_data collector.

[JiriCtvrtka]

Mongo Exporter PR: percona/mongodb_exporter#1323
FB: Percona-Lab/pmm-submodules#4494

[JiriCtvrtka]

@copilot review

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.18%. Comparing base (31318c7) to head (53ebaad).
⚠️ Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/commands/inventory/add_agent_mongodb_exporter.go	0.00%	20 Missing ⚠️
managed/services/inventory/agents.go	0.00%	9 Missing ⚠️
admin/commands/management/add_mongodb.go	0.00%	7 Missing ⚠️
...ommands/inventory/change_agent_mongodb_exporter.go	92.00%	1 Missing and 1 partial ⚠️
managed/models/agent_helpers.go	66.66%	1 Missing ⚠️
managed/services/converters.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5690      +/-   ##
==========================================
+ Coverage   43.59%   45.18%   +1.58%     
==========================================
  Files         415      418       +3     
  Lines       43134    43332     +198     
==========================================
+ Hits        18804    19579     +775     
+ Misses      22454    21813     -641     
- Partials     1876     1940      +64     

Flag	Coverage Δ
admin	34.96% <44.23%> (+0.17%)	⬆️
agent	50.27% <ø> (+1.22%)	⬆️
managed	44.93% <38.88%> (+1.94%)	⬆️
vmproxy	72.22% <ø> (ø)

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