Configs database should auto update connector definitions

[tuliren]

Current Behavior

• Currently the configs database will skip the seed loading step if the database has already been initialized.
• This means that if there are new connectors in the seed, they won't be added to the database.
• It was not a problem in the file system persistence, because all connector definitions were automatically available.
• In the database world, it is no longer automatic. We need to insert the connector record into the database.
• Relates to UI is not getting new sources in setting page #5657.

Expected Behavior

• When user upgrades to a new Airbyte version, new connector definitions should be available.