Revert "[TypeChecker] TypeChecker::isSubtypeOf
should recognize Sendable/@Sendable subtyping"
#72868
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Original PR - #70502
This approach regressed existing ternary expressions that join to
any Sendable
and one branch is inferred from the ternary type variable.
The test-cases introduced by the original PR I left in place with error messages and
TODOs to figure out a way to resolve ambiguity.