Adding ipv6 marker to network metrics tests

[OhadRevah]

Short description:

There will be a lane for running tests with single stack ipv6 cluster, for this effort in this PR I'm adding ipv6 marker to network metrics tests for the lane.

More details:

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for reviewer:

jira-ticket:

https://issues.redhat.com/browse/CNV-80537

Summary by CodeRabbit

• Tests
  • Added IPv6 markers to network and VM metrics tests to enable IPv6-specific test execution.

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📥 Commits

Reviewing files that changed from the base of the PR and between 055ba78 and 2e63509.

📒 Files selected for processing (2)

• tests/observability/metrics/test_network_metrics.py
• tests/observability/metrics/test_vms_metrics.py

---

📝 Walkthrough

Walkthrough

Three test methods across two test files received IPv6 pytest marker annotations. These markers enable tests to run specifically during IPv6-scoped test executions. No modifications to test logic, function signatures, or control flow occurred.

Changes

Cohort / File(s)	Summary
IPv6 Test Markers tests/observability/metrics/test_network_metrics.py, tests/observability/metrics/test_vms_metrics.py	Added IPv6 pytest markers to three test methods. The markers annotate existing tests for IPv6-specific test runs without altering test logic or behavior.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding IPv6 markers to network metrics tests.
Description check	✅ Passed	The description covers required sections with the short description and Jira ticket, but lacks details in 'More details', 'What this PR does / why we need it', and 'Special notes for reviewer' sections.

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[Ahmad-Hafe]

/lgtm