[lldb] [llvm] [lldb] Move SBLanguages.h out of API tree (PR #111929)

[Chelsea Cassanova via llvm-commits]

https://github.com/chelcassanova commented:

This looks good to me and I agree with the original feedback that led to this change in the first place, though I'll also wait for any comments Adrian might have.

https://github.com/llvm/llvm-project/pull/111929