PMM-14832 Support proc-mounts-path for node_exporter

[ademidoff]

PMM-14832

Link to the Feature Build: SUBMODULES-4293

If this PR is related to other PRs, contributions, or ongoing work in this or other repositories, please reference them here:

• PMM-14832 Make mount path configurable node_exporter#212

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.76%. Comparing base (38c9b56) to head (72552c4).
⚠️ Report is 1 commits behind head on v3.

Files with missing lines	Patch %	Lines
agent/agents/supervisor/supervisor.go	0.00%	1 Missing and 1 partial ⚠️
agent/commands/setup.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5214      +/-   ##
==========================================
- Coverage   47.79%   47.76%   -0.04%     
==========================================
  Files         410      410              
  Lines       41981    41959      -22     
==========================================
- Hits        20066    20040      -26     
- Misses      19940    19942       +2     
- Partials     1975     1977       +2     

Flag	Coverage Δ
agent	53.24% <40.00%> (-0.11%)	⬇️

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