Add regression test for TransmuteFrom inference ICE#157200
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Fixes #151314.
Adds a next-solver UI regression test for an unconstrained
TransmuteFrom<T>obligation involving an inference variable.The current compiler emits a normal E0283 type-annotations diagnostic; the test ensures this case does not regress to an ICE.
Verification:
git diff --checkrustfmt +nightly-2026-05-28 --edition 2024 tests\ui\traits\next-solver\issue-151314-transmute-from-inference-var.rsrustc +nightly-2026-05-28 -Znext-solver=globally tests\ui\traits\next-solver\issue-151314-transmute-from-inference-var.rs