[collectd/cpufreq][collectd/memory][collectd/processes][collectd/uptime] Deprecate plugins

[atoulme]

Description:
Deprecate collectD based plugins that are now offered via hostmetrics receiver.

[atoulme]

fix a typo from last PR

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.85%. Comparing base (19e6d0c) to head (2b7c087).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...lfx-agent/pkg/monitors/collectd/cpufreq/cpufreq.go	0.00%	1 Missing ⚠️
...agent/pkg/monitors/collectd/processes/processes.go	0.00%	1 Missing ⚠️
...nalfx-agent/pkg/monitors/collectd/uptime/uptime.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #7096       +/-   ##
===========================================
+ Coverage   25.58%   38.85%   +13.27%     
===========================================
  Files         333      348       +15     
  Lines       23530    24246      +716     
===========================================
+ Hits         6020     9421     +3401     
+ Misses      16741    14042     -2699     
- Partials      769      783       +14     

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