updates Airflow metric units

[lgh2]

What does this PR do?

Updates Airflow metric units to correspond to the values in the Airflow docs

Motivation

Customer request

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.77%. Comparing base (1e1a1f7) to head (f0627fa). Report is 440 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
airflow	92.20% <ø> (?)
cassandra	?
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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[dkirov-dd]

It seems like the airflow documentation was updated. They now specify milliseconds as well, which is in line with our current doc.