Add a `CUSTOM_CONTENT` argument to `cmake_instrumentation()` for collecting
custom content from configure time.
Snippet files include a reference to a JSON file containing any `CUSTOM_CONTENT`
that was added by this command.
Fixes: #26703
Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`, now with "east const" enforcement.
Use `clang-format` version 18.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Issue: #26123