Make define_blocks warning a note

[uramirez8707]

Description
Update so that only the root pe outouts the non uniform block size warning instead of every PE, which will make the stdout very large.

Fixes #1570

How Has This Been Tested?
CI

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[bensonr]

Nice update.

[rem1776]

It looks like this is hitting some kind of deadlock in the CI and is hanging during the openmp test for the new diag_manager. It only happens for the builds that have openmp turned off though.

https://github.com/NOAA-GFDL/FMS/actions/runs/10774360061/job/29934973086?pr=1588#step:7:6253

You should be able to reproduce it if you configure with --disable-openmp.