[clang-tools-extra] [clangd] Add 'apply all clangd fixes' and 'apply all '_' fixes' QuickFixes (PR #79867)

[Tor Shepherd via cfe-commits]

torshepherd wrote:

Another thing that would be nice to solve in a follow-up (applies to unused includes as well btw) is to clean up the list of fixes when someone selects all and presses quick fix:

![image](https://github.com/llvm/llvm-project/assets/49597791/974d1426-0b8d-41f7-8532-0a5b454e3ac9)

Not sure if this is possible server-side though

https://github.com/llvm/llvm-project/pull/79867