[DBMON-5797] Avoid explain plan collection for queries that failed to execute

[eric-weaver]

What does this PR do?

This change updates our explain plan collection query to filter out recently executed queries that have errors. This is done to avoid attempting to explain an unexplainable query and will stop emitting back an explain plan event that's marked as unsupported. We already avoid collection of these in Query samples and Query metrics.

Motivation

Will prevent explain plan event entries that look like this

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 89.12%. Comparing base (46169ca) to head (0f395b2).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

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