feat(common): Add support for targetLabels in ServiceMonitor

[bugok]

Description of the change

This change adds support to targetLabels in the ServiceMonitor object. See documentation for targetLabels here

Removed

None.

Fixed

None.

Added

Supports adding targetLabels to the ServiceMonitor object.

Changed

This change is backwards compatible

Benefits

Possible drawbacks

Users will be able to define targetLabels for their ServiceMonitors. This will allow to capture specific labels' values from the service that the ServiceMonitor monitors.

Applicable issues

None

Additional information

Nope

Checklist

• [x] Title of the PR conforms to the Conventional Commits standard.
• [x] Scope of the of the PR title contains the chart name.
• [ ] Chart version in Chart.yaml has been bumped according to Semantic Versioning.
• [ ] Chart artifacthub.io/changes changelog annotation has been updated in Chart.yaml. See Artifact Hub documentation for more info.
• [x] Variables have been documented in the values.yaml file.

[bugok]

I wrote this PR relying on the CI. Is there any way to run the tests locally, before submitting them? I'd prefer testing locally before uploading a version that people will look at, or the CI fail the tests.