Update karma testing approach

[geographika]

Use Ext.Loader.syncRequire to load required classes in tests and wait for Ext.onReady to run tests.

Any test that uses a variable such as CpsiMapview.controller.grid.Grid will need to ensure it is loaded for the test by adding:

Ext.Loader.syncRequire(['CpsiMapview.controller.grid.Grid']);

Alternatively using Ext.create("CpsiMapview.controller.grid.Grid") can be used to dynamically load the test.

This is an attempt to avoid flaky tests when merging code - see failures at https://github.com/compassinformatics/cpsi-mapview/commits/master
These are mainly due to the test map component being ready causing errors such as TypeError: Cannot read properties of undefined (reading 'map'). Overriding the karma loading process, similar to the approach described at https://stackoverflow.com/a/27390799/179520, only runs the tests once the ExtJS framework is ready.

It also avoids warnings that ExtJS classes have been loaded twice, such as WARN: '[W] [Ext.define] Duplicate class name 'BasiGX.view.form.CoordinateTransform' specified, must be a non-empty string'.

The move to using syncRequire highlighted some discrepancies in class names and missing requires which have been addressed in other pull requests.