If a user has multiple roles that are able to find databases then the…

[nathan5280]

… database was returned in the list multiple times.

This patch removes duplicates instances of the data base from the list of discovered databases.

Description of change

remove duplicates from list of db names.

db_names = list(set(db_names))

# QA steps
 - [ ] automated tests passing
 - [ X] manual qa steps passing (list below)
       Ran locally to verify that the catalog only contained a single entry for the stream.
 
# Risks

# Rollback steps
 - revert this branch

[cmerrick]

Hi @nathan5280, thanks for your contribution!

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[cmerrick]

You did it @nathan5280!

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