Cleanup clearAllMocks() and unmockAll() usage (DEV) #2423

* Cleanup clearAllMocks() and unmockAll() usage.

* If we call `MockKAnnotations.init(this)`, in "Before" then we don't need to clear the mocks in each "After" call, as the mocks will be replaced by new ones.

* Fix textreplace error.

* Split up BaseTest class for unit and instrumentation tests.

* Move  BaseTest and BaseTestInstrumentation to the right packages

* Update BaseTestInstrumentation.kt

* Move it back

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>
Co-authored-by: Mohamed Metwalli <Mohamed.Metwalli@sap.com>