Support yaml and skipCertificateValidation in secret parsing

[tdawe]

Description

Updated the secret parsing:

• Supports either yaml or json
• Added the new key for skipCertificateValidation

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#137

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• E2E tests passed ok karavi-testing/karavi-metrics/metrics-test 110.532s

[tdawe]

run e2e test

[tdawe]

run e2e test

Manual e2e tests were successful:

# go test --count 1 --timeout 15m ./...                        # karavi-testing/karavi-metrics/metrics-util
ok      karavi-testing/karavi-metrics/metrics-test      110.532s