Fix xcdat bounds dim issue with v0.9.1

[tomvothecoder]

Description

• Closes [Bug]: ValueError: Invalid bounds dimension. from enso_diags with latest xcdat0.9.0 #990

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)

[tomvothecoder]

The example from #990 now runs successfully.

e3sm_diags enso_diags --no_viewer --reference_data_path '/lcrc/soft/climate/e3sm_diags_data/obs_for_e3sm_diags/time-series' --test_data_path '/lcrc/group/e3sm/ac.zhang40/example_v3/v3.LR.historical_0051/post/atm/180x360_aave/ts/monthly/5yr' --results_dir '/lcrc/group/e3sm/public_html/diagnostic_output/ac.tvo/tests/pdf_size_1'  --case_id 'TAUX-feedback' --ref_timeseries_input --test_timeseries_input --run_type 'model_vs_obs' --sets 'enso_diags' --variables 'TAUX' --seasons 'ANN' --regions 'global' --regrid_tool 'xesmf' --regrid_method 'conservative_normed' --multiprocessing --num_workers '8' --main_title 'TAUX anomaly (NINO4) vs. TS anomaly (NINO3)' --backend 'mpl' --output_format 'png' --output_format_subplot 'pdf' --canvas_size_w '1212' --canvas_size_h '1628' --figsize '8.5' '11.0' --dpi '150' --arrows --test_name 'v3.LR.historical_0101' --short_test_name 'v3.LR.historical_0101' --test_colormap 'cet_rainbow.rgb' --ref_name 'ERA-Interim' --reference_name 'ERA-Interim' --reference_colormap 'cet_rainbow.rgb' --diff_title 'Model - Observations' --diff_colormap 'diverging_bwr.rgb' --granulate 'variables' 'plevs' 'regions' --selectors 'sets' 'seasons' --test_start_yr '1985' --test_end_yr '2014' --ref_start_yr '1979' --ref_end_yr '1989' --output_format_subplot 'pdf' --plot_type 'scatter'

• Result: https://web.lcrc.anl.gov/public/e3sm/diagnostic_output/ac.tvo/tests/990-xcdat-bnds-dim/enso_diags/TAUX-feedback/

[tomvothecoder]

Hi @chengzhuzhang, this PR is ready for review. Can you also verify that the example from #990 is working for you too? You'll need to build and use the dev env with the dev.yml from this branch.

Once you confirm it is working, feel free to merge this PR.

[chengzhuzhang]

@tomvothecoder I can confirm the enso plot created without errors with the new env that includes xcdat0.9.1.