fix(api/status): remove the database status in dbless mode and data-plane

[AndyZhang0707]

Summary

Remove the meaningless database status information from the status API when operating in dbless mode or data plane.

Checklist

• The Pull Request has tests
• There's an entry in the CHANGELOG
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Full changelog

• [Implement ...]

Issue reference

Fix FTI-5034

[chronolaw]

How about setting database: false? perhaps it is better than removing database field?

[AndyZhang0707]

The database is irrelevant in the dbless mode and data-plane. Leaving the information there may lead to some confusions and the customer may need to think/investigate why it's not reachable. So I'd prefer removing the irrelevant information from the status api completely to eliminate the confusion, but I'm open for suggestions.

[chronolaw]

The database is irrelevant in the dbless mode and data-plane. Leaving the information there may lead to some confusions and the customer may need to think/investigate why it's not reachable. So I'd prefer removing the irrelevant information from the status api completely to eliminate the confusion, but I'm open for suggestions.

It looks reasonable.