[clang-tidy] Update UnusedReturnValueCheck types

Update the types for UnusedReturnValueCheck after D151383.

1. Add std::errc, std:error_condition
2. Remove `absl::Status` - it's marked as `[[nodiscard]]` anyway so it's redundant (and might create double warnings) to check it.

Reviewed By: PiotrZSL

Differential Revision: https://reviews.llvm.org/D151650