[clang] Allow SortIncludes to override DisableFormat when both are explicitly set to true (PR #208916)

[Joseph Tay via cfe-commits]

DynamicProdBreaker wrote:

Is this closer to what you had in mind? I made it a struct instead of an enum since it seemed more natural, opens the door to adding more options to the struct easier than an enum, and lastly because it was easier for me to implement.

https://github.com/llvm/llvm-project/pull/208916