Add custom fields to self signer jobs

[81887821]

Currently annotations, affinity, node selector and tolerations are only applied to self signer init job. It would be better if those are also applied to rotate cronjobs and clean-up job.
My use case is to disable Istio sidecar injection to the clean-up job.

[umi0410]

It will be great supporting both additional labels and annotations.
For your reference, the current related code is here:

helm-charts/cockroachdb/templates/job-cleaner.yaml

Lines 20 to 26 in 0cba0b6

	metadata:
	name: {{ template "selfcerts.fullname" . }}-cleaner
	labels:
	helm.sh/chart: {{ template "cockroachdb.chart" . }}
	app.kubernetes.io/name: {{ template "cockroachdb.name" . }}
	app.kubernetes.io/instance: {{ .Release.Name | quote }}
	app.kubernetes.io/managed-by: {{ .Release.Service | quote }}

[81887821]

Added support for labels

[udnay]

@prafull01 can you take a look at this please?

@81887821 can you please rebase with master?

[81887821]

@udnay done

[prafull01]

LGTM, Approved. @81887821 Please rebase again, so that I can merge this change.