API cleanup: remove deprecated metric.filter

[jotak]

This fields was replaced with metric.filters (plural)

Description

Dependencies

n/a

Checklist

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• Will this change affect NetObserv / Network Observability operator? If not, you can ignore the rest of this checklist.
• Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
• Does this PR require product documentation?
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  • If so, make sure it is described in the JIRA ticket.
• QE requirements (check 1 from the list):
  • Standard QE validation, with pre-merge tests unless stated otherwise.
  • Regression tests only (e.g. refactoring with no user-facing change).
  • No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.08%. Comparing base (70c6881) to head (fd3bc7f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #613   +/-   ##
=======================================
  Coverage   67.07%   67.08%           
=======================================
  Files         104      104           
  Lines        7439     7434    -5     
=======================================
- Hits         4990     4987    -3     
+ Misses       2151     2150    -1     
+ Partials      298      297    -1     

Flag	Coverage Δ
unittests	67.08% <100.00%> (+<0.01%)	⬆️

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[jotak]

/approve

[openshift-ci]

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