Consolidate Validation Helpers

[henryfauna]

Ticket(s): FE-6162

Problem

We have a validateDatabaseOrSecret helper and a validateSecretOrDatabase helper. We don't need both.

Solution

Consolidate onto just one of these.

Result

We have one place where we tell users they need to specify --database, --secret or --local for commands that need to talk to a specific database, eg database create or database delete.