[clangd] NFC, add getLangOpts helper to ParsedAST
The addition of the helper is split out from https://reviews.llvm.org/D69543 as suggested by Kadir. I also updated the existing uses to use the new API.
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The addition of the helper is split out from https://reviews.llvm.org/D69543 as suggested by Kadir. I also updated the existing uses to use the new API.