[FEATURE] Database connection needs updating in order that it doesn't use the sa account

**Is your feature request related to a problem? Please describe.**

Yes the database connection uses the sa account which is should not. In the event of a breach of the details this gives far too much control and would result in serious loss of data.

**Describe the solution you'd like**

Use a manged identity to connect to the database in Staging and production environments

**Describe alternatives you've considered**

We could use a connection string with a reduced user account this would also be an option and possibly simpler to implement but using a managed identity is the right way to go.

**Additional context**
N/A