Product Construction Service should be able to access BAR

[dkurepa]

The Product Construction Service will need to have access to the BAR, we should enable it in code.
An important part of this issue is the local development story.
We want to be able to run Maestro and the Product Construction Service locally, side by side, and have them communicate. Since Maestro is using the SQL Express database locally, we'll do the same thing for the Product Construction Service.
Ideally, they'd both be using a DB inside of a container, but we'll create a followup issue for that

[dkurepa]

The PR for this issue has been merged.
When running on Azure, the service gets the BAR connection string from the KV, and when running locally, the service uses the SQL Express DB, the same one that Maestro uses