feat: Add custom back handler for FullScreenDialogue

[BiancaMihaila]

# Add custom back handler for FullScreenDialogue

• When using the FullScreenDialogue in the LocalAuthImplementation - we require custom back behaviour. Based on the FullScreenDialogue implementation it looks like the dismiss is always required which would technically have the same behaviour as pressing the device back button. We have talked about this in MP and overall the back button behaviour would always align with the dismiss - however, please do raise any potential issues if there are cases/ situations I might have missed/ not account for - This should not be a breaking change as it's not changing the API, rather than assigning the onDismissRequest to the BackHandler

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Quality Gate passed

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76.9% Coverage on New Code
0.0% Duplication on New Code

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