ROX-21702: fix error matching logic for central-tls secret not found

[johannes94]

Description

The check on the expected error when central-tls secret was not yet created before routes get created was broken because the error we checked for was no longer returned. Leading to error logs like:

E0111 15:09:47.955154 1 runtime.go:246] Unexpected error occurred rhacs-cmg021tu6lpgt9015g6g/probe-7687b89ff9-kd2jv-4fb9: updating routes: creating reencrypt route for central cmg021tu6lpgt9015g6g: getting central-tls secret for tenant probe-7687b89ff9-kd2jv-4fb9: central-tls secret not found 

I've implemented a solution that should now properly check for this error again:

Checklist (Definition of Done)

• Unit and integration tests added
• [ ] Added test description under Test manual -> CI is sufficient
• 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
• [ ] (If applicable) Changes to the dp-terraform Helm values have been reflected in the addon on integration environment

Test manual

TODO: Add manual testing efforts

# To run tests locally run:
make db/teardown db/setup db/migrate
make ocm/setup
make verify lint binary test test/integration

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johannes94, kovayur

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[kovayur]

Thanks for the fix @johannes94