Fix high variance cv message for automl

[angela97lin]

Closes #1280
Fixes the high variance CV message during AutoML after the data checks API update:

Currently on main:

[codecov]

Codecov Report

Merging #1462 (5254921) into main (ef01e1b) will not change coverage.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##             main    #1462   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         223      223           
  Lines       15001    15001           
=======================================
  Hits        14994    14994           
  Misses          7        7           

Impacted Files	Coverage Δ
evalml/automl/automl_search.py	99.7% <100.0%> (ø)

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[dsherry]

Awesome!! 🚢

[freddyaboulton]

Thanks @angela97lin !!

[dsherry]

@angela97lin does this fix #1280?

[angela97lin]

@dsherry I'm not sure what the output looked like before for #1280 but I'd argue it does look well-formatted now so I guess so 👍