Return the blue banner to nudge people to connect your database

[trinya]

Is your feature request related to a problem? Please describe.
We are observing lower activation rates in April after the banner was removed.
We would like to still get calls with PAs with people who are looking for a solution to have an internal DB offered with Metabase (capability we're building right now with Baby's First DWH)

Describe the solution you'd like

1. Please revert the change made here:
   Get rid of database connection help banner #40644
   and get the database banner back as it was.
2. Please check that the calendly link under the "Get help connecting" points at https://calendly.com/pierinasalinas/connect-to-metabase

How important is this feature to you?
Very important - we should get the activation rates back as less people would convert and retain with our product. Additionally we need customer insights for Baby's First DWH to make decisions on how to price the new piece of product we're building and what kind of features should we include.