Move json declaration file emit behind a experimentalJsonDeclarationEmit
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#34962
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This way it can still be opted in to while we're iterating on it (with the caveat that certain things may change), and we can still track all of the tests related to it while we work. This seems a little nicer than attempting to strip the feature out entirely, as it gives us a way to backport the fixes we make in 3.8 before unflagging it to 3.7 without breaking anyone who didn't opt-in (and allows anyone who started using it with Monday's release to still have a way to use it in the 3.7 branch).