Add ESMF v8.4.1, and number of other changes to improve ESMF integration with Spack (#35980)

* Add v8.4.1, and a few other changes.
    Minor adjustments for better alignment between Spack and ESMF native
    build. For ESMF >= 8.3.1 now Spack defaults to using
    external-parallelio. Before use internal version, which was PIO-1 all
    the way up to v8.3.0b10 anyway! Xerces is disabled by default.
* Deal with two long lines flagged by prechecks/style.
* Try to satisfy prechecks/style.
* Try to satisfy flake8 rules wrt indentation of continuation lines.
* Now trying to satisfy "black reformatting".
* For "black" formatting really put that ugly comma at the end before
closing parentheses. Interesting.
* Support building against external-parallelio even w/o mpi, but select the
   external-parallelio dependency accordingly.
* Correct C compiler setting.
* Handle `pnetcdf` variant consistent with how `ParallelIO` does it. And
  also pass the `pnetcdf` variant down to the `external-parallelio`
  dependency if set.
* Long line formatting again.
* Simplify handling of tarball URL construction and update sha256
  checksums.
* Align version check with recommended self.spec.satisfies().
* Deprecate v8.4.0 which has a bug that can cause memory corruption, fixed
  in v8.4.1.
* Use double quotes vs single quotes as per style-check... although
  https://spack-tutorial.readthedocs.io/en/latest/tutorial_packaging.html#querying-spec-versions
  clearly shows it with single quotes.

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