Add migrations prelude to frame umbrella crate #7119
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I noticed that we don't yet have a migrations prelude, which felt prudent; This PR adds that. In addition, it also shuffles the try_runtime prelude into both the testing and migrations prelude, as it seemed it would be unclear where to source the try_runtime types from with the redundancy introduced by the migrations prelude. Also small update to multisig pallet to use new prelude.
@re-gius