Update Gersemi and make it fail on warnings

[maxtropets]

Noticed during #7839 :

Formatting files in cmake samples src tests CMakeLists.txt
Warning: unknown command 'add_fuzz_test' used at:
/workspaces/CCF/CMakeLists.txt:681:7

...

All checks passed

Not good, not terrible.

Added --warnings-as-errors which only exists v0.19 onwards, so decided to go 0.27 at once, because why not.

[Copilot]

Pull request overview

This PR updates the repository’s CMake formatting workflow to use a newer gersemi version and to treat formatter warnings (eg unknown commands) as hard failures, preventing “green” formatting checks when warnings are present.

Changes:

• Bump gersemi from 0.17.0 to 0.27.0 and enable --warnings-as-errors in the CMake format check script.
• Add a stub definition for add_fuzz_test() so gersemi recognizes this custom CMake command.
• Apply formatter-driven whitespace/inlining changes across several CMake files.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
scripts/check-cmake-format.sh	Updates gersemi version and enables warnings-as-errors; adds explicit failure handling for -i.
cmake/gersemi_definitions.cmake	Adds stub add_fuzz_test(); minor formatting changes to existing stubs.
cmake/common.cmake	Formatter-driven inlining of cmake_parse_arguments(PARSE_ARGV …) calls.
cmake/ccf_app.cmake	Formatter-driven inlining of cmake_parse_arguments(PARSE_ARGV …) calls.
CMakeLists.txt	Formatter-driven inlining for list(), file(READ), and file(GENERATE) argument layout.
.gersemirc	Updates schema URL to match gersemi 0.27.0.