[Databricks cost overview] Fix cluster and job specific widgets

[aboitreaud]

What does this PR do?

• scope the widgets to cluster_id:* or job_id:* to avoid having an N/A row at the top
• fix percentage memory utilized that was missing a 100 factor: previously was:

Motivation

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

[github-actions]

⚠️ Recommendation: Add qa/skip-qa label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.