Re-integrate two tests that were disabled for the NavigationTests.

[markdevocht]

What happened?

The RNNCommandsHandlerTest and RNNModalManagerEventHandlerTest are currently not working.
So they were removed from the testing list.

What was the expected behaviour?

The tests are supposed to run without problems.
We need to fix them and re-integrate these tests.

Was it tested on latest react-native-navigation?

• I have tested this issue on the latest react-native-navigation release and it still reproduces.

Help us reproduce this issue!

No response

In what environment did this happen?

React Native Navigation version:
React Native version:
Has Fabric (React Native's new rendering system) enabled: (yes/no)
Node version:
Device model:
iOS version: