Set CMake policy CMP0144 to new to use <PACKAGENAME>_ROOT env vars

[bartlettroscoe]

This eliminates warnings like:

CMake Warning (dev) at cmake/tribits/core/package_arch/TribitsProjectImpl.cmake:80 (find_package):
  Policy CMP0144 is not set: find_package uses upper-case <PACKAGENAME>_ROOT
  variables.  Run "cmake --help-policy CMP0144" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  Environment variable GIT_ROOT is set to:

    /projects/sems/install/rhel8-x86_64/sems/utility/git/2.37.0/gcc/8.3.0/base/vmjqb3w

  For compatibility, find_package is ignoring the variable, but code in a
  .cmake module might still use it.
Call Stack (most recent call first):
  cmake/tribits/core/package_arch/TribitsProject.cmake:62 (tribits_project_impl)
  CMakeLists.txt:53 (TRIBITS_PROJECT)
This warning is for project developers.  Use -Wno-dev to suppress it.

This is part of:

• CMake 4.0.0 with breaks in backward compatibility to be released in 2/2025 trilinos/Trilinos#13731

[rabartlett1972]

I tested this locally and it made the warning go away.

[rabartlett1972]

I tested this locally and it make that warning go away for Trilinos configure.