[BUG]: Issues while using PowerFlex secret for Observability

[tdawe]

Describe the bug
Issues while using PowerFlex secret for Observability:

• The Secret (vxflexos-creds) is in yaml format but metrics-powerflex is expecting json
• The key insecure has been renamed to skipCertificateValidation. This is preventing authentication against the PowerFlex.

To Reproduce
Steps to reproduce the behavior:

1. Deploy the PowerFlex driver and Observability
2. Copy the vxflexos-creds secret into the Observability namespace
3. View errors in logs for karavi-metrics-powerflex

Expected behavior
The secret used by the PowerFlex driver should be used by Observability without errors

Screenshots
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Logs
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System Information (please complete the following information):

• OS/Version: [e.g. RHEL 7.6]
• Kubernetes Version [e.g. 1.18]
• Additional Information...

Additional context
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