Add Karpenter metric coverage up to v1.8

[ddog-nasirthomas]

What does this PR do?

Adds missing metrics to ensure full coverage for v1.8

Motivation

FRAGENT-3338

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.99%. Comparing base (a761dc0) to head (1ae7b53).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

🚀 New features to boost your workflow:

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