ROX-31105: Fix InternalCentralIDs reading

[kurlov]

Description

Fix parsing env for InternalCentralIDs. The StringSliceVar should be used when multiple values separated by comma. Also add logging for flag values

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.
• Add secret to app-interface Vault or Secrets Manager if necessary
• RDS changes were e2e tested manually
• Check AWS limits are reasonable for changes provisioning new resources

Test manual

N/A

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kovayur, kurlov

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[kurlov]

/retest

[kurlov]

/retest

[openshift-ci]

New changes are detected. LGTM label has been removed.