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

[DusanJovic-NOAA]

Pull Request Summary

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

Description

ufs-weather-model now uses the FindESMF.cmake module provided by the ESMF library, so there's no need to keep a local copy. Also, the name of the imported esmf teget is changed to ESMF::ESMF.

Issue(s) addressed

Commit Message

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

Check list

• Branch is up to date with the authoritative repository (NOAA-EMC) develop branch.
• Checked the checklist for a developer submitting to develop.
• If a version number update is required, checked the updating version number checklist.
• If a new feature was added, a regression test for testing the new feature is added.

Testing

• How were these changes tested? ufs-weather-model regression test
• Are the changes covered by regression tests? (If not, why? Do new tests need to be added?)
• Have the matrix regression tests been run (if yes, please note HPC and compiler)?
• Please indicate the expected changes in the regression test output, (Note the list of known non-identical tests.)
• Please provide the summary output of matrix.comp (matrix.Diff.txt, matrixCompFull.txt and matrixCompSummary.txt):

[JessicaMeixner-NOAA]

Noting on this PR that it should be merged w/the UFS level -- and will be coordinated w/other component changes, etc.