Set max_depth to 1 in dfs calls

[freddyaboulton]

Pull Request Description

Fixes #2219

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After creating the pull request: in order to pass the release_notes_updated check you will need to update the "Future Release" section of docs/source/release_notes.rst to include this pull request by adding :pr:123.

[codecov]

Codecov Report

Merging #2231 (05c434e) into main (3fc568d) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #2231     +/-   ##
=======================================
+ Coverage   99.9%   99.9%   +0.1%     
=======================================
  Files        280     280             
  Lines      24089   24105     +16     
=======================================
+ Hits       24064   24080     +16     
  Misses        25      25             

Impacted Files	Coverage Δ
...ponents/transformers/preprocessing/featuretools.py	100.0% <ø> (ø)
...ents/transformers/preprocessing/text_featurizer.py	100.0% <ø> (ø)
evalml/tests/component_tests/test_featuretools.py	100.0% <100.0%> (ø)
...alml/tests/component_tests/test_text_featurizer.py	100.0% <100.0%> (ø)

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[angela97lin]

Nice and clean, LGTM 👍

[jeremyliweishih]

nice catch!

[bchen1116]

Nice!

[dsherry]

LGTM!

When we do the next release, let's make sure we run text datasets and see if this decreased the runtime.

[ParthivNaresh]

Perfect!