chore: add labels to metrics

[Suraiya-Hameed]

What type of PR is this?
/kind feature
/kind documentation

What this PR does / why we need it:

• Adds additional labels pod_name, pod_namespace and secret_provider_class to the existing metrics.
• Fixes documentation about current metrics

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #1344

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests

[k8s-ci-robot]

Hi @Suraiya-Hameed. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Suraiya-Hameed
Once this PR has been reviewed and has the lgtm label, please assign aramase for approval. For more information see the Kubernetes Code Review Process.

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[aramase]

/ok-to-test

[Suraiya-Hameed]

@aramase is there anything I should do about the pull-secrets-store-csi-driver-e2e-windows tests failing, looks like intermittent failure from the history!

[aramase]

@aramase is there anything I should do about the pull-secrets-store-csi-driver-e2e-windows tests failing, looks like intermittent failure from the history!

Nothing you need to do. It seems to be a flake with cluster creation.

[aramase]

/retest-required

[Suraiya-Hameed]

@aramase gentle nudge to review this PR.

[aramase]

/assign nilekhc

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.00000% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 36.82%. Comparing base (608fae1) to head (7eb8f38).

Files	Patch %	Lines
pkg/secrets-store/stats_reporter.go	0.00%	12 Missing ⚠️
pkg/secrets-store/mocks/stats_reporter_mock.go	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1433      +/-   ##
==========================================
+ Coverage   36.54%   36.82%   +0.28%     
==========================================
  Files          63       63              
  Lines        4532     4567      +35     
==========================================
+ Hits         1656     1682      +26     
- Misses       2732     2741       +9     
  Partials      144      144              

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