IWYU: Update for Debian 13 CI job

`include-what-you-use` diagnostics, in practice, are specific to
the environment's compiler and standard library.  Update includes
to satisfy IWYU for our CI job under Debian 13.  Some patterns:

* Types named in virtual `override` signatures no longer require
  includes since the overridden signature already names them.

* A function argument's type needs to be included even if its constructor
  is called only by implicit conversion.  For example, constructing a
  `std::function` from a lambda now requires `<functional>`.

* Some prior mysterious `<type_traits>` inclusions are no longer required.

Source/cmFindBase.h

@@ -11,9 +11,7 @@
 #include "cmFindCommon.h"
 #include "cmStateTypes.h"
 
-class cmConfigureLog;
 class cmExecutionStatus;
-class cmMakefile;
 
 /** \class cmFindBase
  * \brief Base class for most FIND_XXX commands.