Application.InternalInit no longer resets ConfigurationManager - Unit tests need updating

[tig]

In #3339 I changed InternalInit to not reset CM.

This enables Application to retain previous theme settings... This enables changing theme settings in UI Catalog to be reflected into a Scenario when run.

However, it means that any Unit Test that changes a setting in CM must call Reset on exit. If not, it will lead to spurious unit test failures where tests depend on default configuration.

The fixes are:

• Add a call to CM.Reset in the AutoInitshutdown After handler.
• Update CM Unit tests to call Reset.