[occm] Fix serviceMonitor labelSelector and remove deprecated bearerTokenFile auth

[claudia-lola]

What this PR does / why we need it:
The labels on the Service did not match the ServiceMonitor selector. Prometheus was unable to discover the target. This change sets the labels so the ServiceMonitor selects the correct Service.
bearerTokenFile is deprecated and no longer works. ServiceMonitor was updated to use a supported authentication method.
authorization-always-allow-paths="/metrics" was added to ensure metrics can be scraped.
Which issue this PR fixes(if applicable):
fixes #3144

Special notes for reviewers:

Release note:

Fix serviceMonitor labelSelector and remove deprecated bearerTokenFile auth

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: claudia-lola / name: Claudia Watson (57d51da, 596b5dc, 8f36583, e6d8842)

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[jihyun-huh]

Thanks @claudia-lola,
Ive reviewed the latest update and verified the rendered chart locally with serviceMonitor.enabled=true.

Hi, @kayrus I don’t see any remaining blockers from my side. Looks good to merge.

[jihyun-huh]

Hi @claudia-lola , one small follow-up after #3080 was merged, the OCCM chart version on master is now 2.36.1, which is the same version currently used in this branch.

cloud-provider-openstack/charts/openstack-cloud-controller-manager/Chart.yaml

Line 7 in d4b45ce

version: 2.36.1

Could you please rebase on the latest master and update the chart version to 2.36.2?

cc. @gouthampacha @kayrus

[jihyun-huh]

@gouthampacha, would you be able to take a reviewer pass and add /lgtm, if this looks good?

cc. @kayrus for approval after the reviewer pass. This fixes the out-of-the-box ServiceMonitor issue described in #3144.

[gouthampacha]

/lgtm

looks good, thanks @claudia-lola

[zetaab]

/lgtm

[zetaab]

/approve

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This pull-request has been approved by: zetaab

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