[Bug]: Address warnings produced during diagnostic run (latest main)

[tomvothecoder]

What happened?

Warning 1 -- xgcm.grid.py -- related to xCDAT/xcdat#513, can't address this one directly

2025-02-04 15:06:12,956 [WARNING]: warnings.py(_showwarnmsg:112) >> /home/ac.tvo/miniforge3/envs/e3sm_diags_dev_930/lib/python3.12/site-packages/xgcm/grid.py:989: FutureWarning: From version 0.8.0 the Axis computation methods will be removed, in favour of using the Grid computation methods instead. i.e. use `Grid.transform` instead of `Axis.transform`
  warnings.warn(

Warning 2 -- cartopy.mpl.geoaxes.py

2025-02-04 15:06:22,608 [WARNING]: warnings.py(_showwarnmsg:112) >> /home/ac.tvo/miniforge3/envs/e3sm_diags_dev_930/lib/python3.12/site-packages/cartopy/mpl/geoaxes.py:856: UserWarning: Attempting to set identical low and high xlims makes transformation singular; automatically expanding.
  self.set_xlim([x1, x2])

Warning 3 -- plot.taylor_diagram.py

2025-02-04 15:19:16,672 [WARNING]: warnings.py(_showwarnmsg:112) >> /gpfs/fs1/home/ac.tvo/E3SM-Project/e3sm_diags/e3sm_diags/plot/taylor_diagram.py:94: UserWarning: No artists with labels found to put in legend.  Note that artists whose label start with an underscore are ignored when legend() is called with no argument.
  ax.legend(loc="center left", bbox_to_anchor=(1, 0.5))

What did you expect to happen? Are there are possible answers you came across?

No response

Minimal Complete Verifiable Example (MVCE)

Relevant log output

Anything else we need to know?

No response

Environment

Latest main and v3.0.0rc1/rc2