Add resourceVersion to CronJob metrics

[pkbhowmick]

Signed-off-by: Pulak Kanti Bhowmick pkbhowmick007@gmail.com

What this PR does / why we need it:
This PR adds resourceVersion metrics for CronJob resource.

Which issue(s) this PR fixes:
Fixes #1433

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[pkbhowmick]

/assign @tariq1890

[tariq1890]

I think this is okay to add since it's useful to track changes in the CronJob manifest.

cc @lilic @brancz @mrueg waiting on a second approval in case one of you needed a chance to look at this

/approve
/hold

[lilic]

/lgtm

Thank you!
/hold cancel

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilic, pkbhowmick, tariq1890

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