Remove local copy of FindESMF.cmake and rename esmf target to ESMF::ESMF

[DusanJovic-NOAA]

Description

This PR removes local copy of FindESMF.cmake and renames esmf target to ESMF::ESMF. ufs-weather-model now uses the FindESMF.cmake module provided by the ESMF library. No change in the baselines is expected.

Issue(s) addressed

Link the issues to be closed with this PR, whether in this repository, or in another repository.
(Remember, issues should always be created before starting work on a PR branch!)

• fixes #<issue_number>
• fixes noaa-emc/fv3atm/issues/<issue_number>

Testing

How were these changes tested? ufs-weather-model regression test
What compilers / HPCs was it tested with? Intel/GNU on Ursa
Are the changes covered by regression tests? Yes
Have the ufs-weather-model regression test been run? Yes. On what platform? Ursa.

• Will the code updates change regression test baseline? No.

Dependencies

If testing this branch requires non-default branches in other repositories, list them.
Those branches should have matching names (ideally)

Do PRs in upstream repositories need to be merged first?
If so add the "waiting for other repos" label and list the upstream PRs

• waiting on Remove local copy of FindESMF.cmake and rename esmf target to ESMF::ESMF NOAA-GFDL/GFDL_atmos_cubed_sphere#388

[gspetro-NOAA]

Could we get this subcomponent PR reviewed so that it's ready to go when we begin to process WM PR #2406 sometime next week?

[gspetro-NOAA]

@DusanJovic-NOAA atmos_cubed_sphere PR 388 has merged. Please go ahead and revert .gitmodules/update hash to 0ca27ba.

[gspetro-NOAA]

Testing for WM parent PR #2406 has passed, the atmos_cubed_sphere PR 388 has been merged, and Dusan has reverted .gitmodules/updated the hash. This PR is ready to merge.