[collectd/protocols] deprecate monitor

[atoulme]

Description:
Please use the hostmetrics receiver with the network scraper instead.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 33.21%. Comparing base (c4cc736) to head (b325952).

Files with missing lines	Patch %	Lines
...agent/pkg/monitors/collectd/protocols/protocols.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7170      +/-   ##
==========================================
+ Coverage   32.97%   33.21%   +0.24%     
==========================================
  Files         327      330       +3     
  Lines       23113    23332     +219     
==========================================
+ Hits         7621     7750     +129     
- Misses      14611    14685      +74     
- Partials      881      897      +16     

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