[release-1.10] NETOBSERV-2438: Metrics filters, allow OR on same key

[openshift-cherrypick-robot]

This is an automated cherry-pick of #1127

/assign jotak

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: NETOBSERV-2438

In response to this:

This is an automated cherry-pick of #1127

/assign jotak

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

Hi @openshift-cherrypick-robot. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.87%. Comparing base (8a01aec) to head (65def73).
⚠️ Report is 1 commits behind head on release-1.10.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.10    #1136      +/-   ##
================================================
+ Coverage         66.77%   66.87%   +0.10%     
================================================
  Files               121      121              
  Lines              7572     7584      +12     
================================================
+ Hits               5056     5072      +16     
+ Misses             2184     2181       -3     
+ Partials            332      331       -1     

Flag	Coverage Δ
unittests	66.87% <100.00%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/pipeline/encode/metrics/filtering.go	100.00% <100.00%> (ø)
pkg/pipeline/encode/metrics/preprocess.go	93.61% <100.00%> (+4.48%)	⬆️

... and 1 file with indirect coverage changes

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