[collectd/apache] Deprecate the plugin

[atoulme]

Description:
Deprecate the collectd/apache plugin.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.08%. Comparing base (6e453cb) to head (1a65c7a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7089      +/-   ##
==========================================
- Coverage   38.10%   38.08%   -0.02%     
==========================================
  Files         358      358              
  Lines       25107    25107              
==========================================
- Hits         9568     9563       -5     
- Misses      14746    14749       +3     
- Partials      793      795       +2     

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