Fix Database access ANRs

[seadowg]

An example was reported here.

Our forms and instances databases should not be accessed the UI thread. We can use StrictMode.noteSlowCall in our DatabaseConnection (on accessing a writable or readable DB) to detect these in debug builds and instrumented tests.

[seadowg]

After the work done in #5867, the main focus to get this done is to be able to call StrictMode.noteSlowCall("Accessing readable DB") in DatabaseConnection instead of in the database backed repository implementations and have all tests passing.

[seadowg]

The goal here now will be to remove the strict parameter from DatabaseConnected (always call noteSlowCall on DB accesses).

[seadowg]

It looks like a significant rewrite (replacing InstanceChooserList most noteably) is required to make any more progress here so let's move it to the next release.