[charts] add support for podLabels and podAnnotations to occm and cinder-csi-plugin charts

[roehlc]

What this PR does / why we need it:

• feat: add support for defining podLabels and podAnnotations in the openstack-cloud-controller-manager and cinder-csi-plugin charts
• fix: explain where commonAnnotations are applied in cinder-csi-plugin chart

Which issue this PR fixes(if applicable):

• fixes -

Special notes for reviewers:

• please let me know if I chose the correct chart versions - I did not find any documentation about the conventions used by the charts in this repo. My interpretation was the following: the minor chart version is in sync with the appVersion which in turn is in sync with the minor k8s release

Release note:

[charts/occm] add support for podLabels and podAnnotations in helm chart
[charts/cinder-csi-plugin] add support for podLabels and podAnnotations in helm chart

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: roehlc (463b380, 84e865f, 0171da0, 61bec6b, f349a95, ec74b92, 17b5070, 1a5b42c, 593e1e4)

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Hi @roehlc. Thanks for your PR.

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[jichenjc]

/ok-to-test
/easy-cla

[dulek]

Could we wrap all these into some template functions, so that we don't need to write whole with-toYaml-end? Also a bunch of remarks inline.

[roehlc]

Could we wrap all these into some template functions, so that we don't need to write whole with-toYaml-end? Also a bunch of remarks inline.

I added helper templates to remove the need to write "with-toYaml-end" and addressed the remarks inline.

@dulek Would you please take another look?

[dulek]

/lgtm

Leaving approval for someone more experienced with Helm.

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PR needs rebase.

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/lifecycle stale

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[roehlc]

/remove-lifecycle stale

[roehlc]

/retest

[roehlc]

@dulek , @kayrus , @zetaab
do any of you have capacity to take a look at this PR?

As far as I can tell I implemented the requested changes. As described in my first comment I'm unsure about the chart version and would suggest squashing the commits after your review is finished.

[jichenjc]

/lgtm

[k8s-ci-robot]

PR needs rebase.

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