[ty] Reject fixed tuples for non-inferable TypeVarTuples - #27943

[ty] Reject fixed tuples for non-inferable TypeVarTuples#27943

carljm wants to merge 2 commits into

cjm/ty-typevartuple-unknown-recoveryastral-sh/ruff:cjm/ty-typevartuple-unknown-recoveryfrom

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