Hello Matthew,
My understanding is that you're deploying Sentinel using Bicep and facing an issue where the solution is installed, but the connector is not showing up.
The resource type Microsoft.SecurityInsights/contentPackages is not listed in the official documentation for ARM templates or Bicep, which suggest it is not currently available for use.
However, I see connector (data connector) is available as Microsoft.SecurityInsights/dataConnectors. For more details do refer to the documentation.
Please share your full bicep code for a chance to look through its details, if possible.