[6.2][swift-settings] Now that we aren't using it immediately, remove it from tree. #81334
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Explanation: This patch just removes SwiftSettings support from 6.2 since we aren't using it anymore. It also ensures that we do not expose any new ABI as a result of the stdlib part of this feature. If we ever need this we can always get it back from the git history.
Scope: Remove unused code. By removing this we do not expose the code to any users and also ensure that the stdlib part of this feature does not expose any ABI that we would have to maintain indefinitely.
Resolves: rdar://150695113
Main PR: #81306, #81336
Risk: Low. This just reverts a feature that we decided to do a different way. It was not enabled by default and but did expose some ABI which was not relied on by any users.
Testing: N/A
Reviewer: @compnerd