[mongo] skip explain administrative aggregation pipeline

[lu-zhengda]

What does this PR do?

This PR skips explain plan collection for mongo administrative aggregation pipeline, including $collStats, $currentOp, $indexStats and $sample.

Motivation

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• 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

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.87%. Comparing base (8d5b9cd) to head (02530ac).
Report is 53 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
ignite	?
mongo	93.26% <91.66%> (-0.25%)	⬇️
presto	?

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