Add prometheus-helm-values.yaml

[dishankkalra23]

Description

This PR adds helm yaml values for Prometheus agent which will be used by Prometheus agent DA in tests.

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Git Issue

https://github.ibm.com/GoldenEye/issues/issues/10866

Release notes content

Adds helm yaml values for Prometheus agent

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• If relevant, a test for the change is included or updated with this PR.
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