Restore Raw Slice as input test pending Sway changes

[camsjams]

Motivation

As part of #1343, some tests for raw slice inputs with scripts were disabled.

Either this gets fixed:
FuelLabs/sway#5145

Or the tests need to be rewritten

[danielbate]

This is still blocked as a script will throw when attempting to use a raw_slice in a main function:

Returning a type containing `raw_slice` from `main()` is not allowed. Consider converting it into a flat `raw_slice` first.

This is tracked in sway here.

[danielbate]

@arboleya could you confirm whether this should still have epic labelled, and this should no longer be blocked on the fuel project board.

[arboleya]

Labels and milestones updated.