Revert "Support __available__((swift_attr("@Sendable")))" #40262
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Reverts #40170
This broke the Windows build: https://ci-external.swift.org/job/swift-PR-windows/18665/console
The tests on the PR indicated that it was part of the change.. This should be easy to fix, there is a missing symbol (either a missing dependency or function). However, given the imminent freeze, I'd like to get the tree green.