Run clang-format and enable CI check for it (#755)

* pre-commit: Update and enable clang-format check

There is newer version from clang-format so use that. We do not yet want
18 as that is little bit too new.

* Format some thing by hand which clang-format "breaks"

Clang-format will format some things little bit off in some cases.
Format some things by hand so we get cleaner end result.

* Run clang-format with

```
pre-commit run --all-files clang-format
```

We have already in previously checked places where clang-format does not
make good format and ignored those (hopefully most of the things).

---------

Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>

.pre-commit-config.yaml

@@ -47,11 +47,10 @@ repos:
         args: ["--whitespaces-count", "2"]
         files: '.*\.(yaml|yml|html|htm)|Dockerfile$'
 
-  # We will enable this in future.
-  # - repo: https://github.com/pre-commit/mirrors-clang-format
-  #   rev: 3b03191b6a60cba0fc25c2dc2e30ea4854d897eb # v17.0.5
-  #   hooks:
-  #     - id: clang-format
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: 05241dc3def184dba136e62d54ff57f1c8a497a9 # v17.0.6
+    hooks:
+      - id: clang-format
 
   # We might enable this in future.
   # - repo: https://github.com/pre-commit/mirrors-prettier