Revise C++ coding style using clang-format with "east const"

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

Source/cmGeneratedFileStream.h

@@ -139,7 +139,7 @@ public:
    * Set name of the file that will hold the actual output. This method allows
    * the output file to be changed during the use of cmGeneratedFileStream.
    */
-  void SetName(const std::string& fname);
+  void SetName(std::string const& fname);
 
   /**
    * Set set a custom temporary file extension used with 'Open'.