We rely, that standard library have really effective `+=` and `+` operators
for `std::string` with any paired arguments: `std::string`, `const char *` and `char`.
So, that change just blocks `c = a + b` and `c += a` replacements,
but still replaces the `c = a + b + d` and `c += a + b` and longer (with more `+` operators).
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