NETOBSERV-1596 fix latest not resetting on DNS / RTT metrics

[jpinsonneau]

Description

Steps to reproduce:

• Show latest bytes
• Switch to DNS

Metric function must switch to average.

Dependencies

n/a

Checklist

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• 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?
  • If so, make sure the JIRA epic is labelled with "documentation" and provides a description relevant for doc writers, such as use cases or scenarios. Any required step to activate or configure the feature should be documented there, such as new CRD knobs.
• Does this PR require a product release notes entry?
  • If so, fill in "Release Note Text" in the JIRA.
• Is there anything else the QE team should know before testing? E.g: configuration changes, environment setup, etc.
  • 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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.92%. Comparing base (b45cee2) to head (add2068).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #518      +/-   ##
==========================================
+ Coverage   57.27%   57.92%   +0.65%     
==========================================
  Files         169      137      -32     
  Lines        8487     6598    -1889     
  Branches     1160     1160              
==========================================
- Hits         4861     3822    -1039     
+ Misses       3299     2572     -727     
+ Partials      327      204     -123     

Flag	Coverage Δ
uitests	57.92% <100.00%> (ø)
unittests	?

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[memodi]

/ok-to-test

[github-actions]

New image:
quay.io/netobserv/network-observability-console-plugin:e8ff482

It will expire after two weeks.

To deploy this build, run from the operator repo, assuming the operator is running:

USER=netobserv VERSION=e8ff482 make set-plugin-image

[memodi]

@jpinsonneau re-ran tests confirming this PR fixes the bug.

/label qe-approved

[openshift-ci]

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