[TODO] Undo fix once dev has offboarded

[acatchpole]

Describe the task

Remove the following code from Startup.cs :
builder.AddJsonFile("secrets.json", optional: true, reloadOnChange: true);
It should be around line 49, inside the if (env.IsDevelopment()) statement.

Purpose
This code was added to address an issue that was only experienced by one dev (acatchpole). This fix was not known to be required for running this application anywhere other than that one dev's local machine. Once that dev has offboarded from Sustainment, this change should be undone as it is no longer needed.

Acceptance Criteria

• The code statement has been removed
• The issue described in initial context does not exist for any other team member

Additional context

• This was added because for one dev, the Connection String in secrets.json was no longer being loaded into the Configuration Object. Then, when the first database operation is attempted ( context.Database.Migrate(); ), the app crashes with the error "Host can't be null". It is unknown why this issue started and why doing everything short of reformatting the computer did not fix this issue, given it works for everyone else and WAS working for the dev.