docs: update OpenTelemetry set up documentation

[JessicaJHee]

Description

Updates the metrics set up documentation to reflect the new behaviour after adopting OpenTelemetry in this PR

Which issue(s) does this PR fix

RHIDP-4404

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[JessicaJHee]

waiting for this PR to be accepted [Done]

[kim-tsao]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kim-tsao

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• OWNERS [kim-tsao]

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[kim-tsao]

I'm going to force merge this as it's just a docs update

[kim-tsao]

/cherrypick release-1.4

[openshift-cherrypick-robot]

@kim-tsao: new pull request created: #1998

In response to this:

/cherrypick release-1.4

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