languages: Recognize .clang-format as YAML (#43469)

Clang-Format uses uses a YAML config file format.

Use YAML language by default for `.clang-format` and `_clang-format`
filenames.
([source](https://clang.llvm.org/docs/ClangFormatStyleOptions.html))
Add `#yaml-language-server: $schema` to `.clang-format` example in C
language docs.

Release Notes:

- Added support for identifying. `.clang-format` files as YAML by
default

crates/languages/src/yaml/config.toml

@@ -1,6 +1,6 @@
 name = "YAML"
 grammar = "yaml"
-path_suffixes = ["yml", "yaml", "pixi.lock"]
+path_suffixes = ["yml", "yaml", "pixi.lock", "clang-format"]
 line_comments = ["# "]
 autoclose_before = ",]}"
 brackets = [