Removed first batch from default algorithm

[christopherbunn]

Resolves #4219

[codecov]

Codecov Report

Merging #4215 (5a0f530) into main (2481ed1) will increase coverage by 15.3%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##            main   #4215      +/-   ##
========================================
+ Coverage   84.4%   99.7%   +15.3%     
========================================
  Files        349     349              
  Lines      38294   38284      -10     
========================================
+ Hits       32320   38165    +5845     
+ Misses      5974     119    -5855     

Impacted Files	Coverage Δ
.../automl_tests/test_automl_search_classification.py	96.4% <ø> (+96.4%)	⬆️
...valml/automl/automl_algorithm/default_algorithm.py	99.7% <100.0%> (+26.9%)	⬆️
evalml/automl/automl_search.py	99.8% <100.0%> (+35.7%)	⬆️
evalml/tests/automl_tests/test_automl.py	99.5% <100.0%> (+99.5%)	⬆️
...valml/tests/automl_tests/test_default_algorithm.py	100.0% <100.0%> (+100.0%)	⬆️
evalml/tests/automl_tests/test_search.py	100.0% <100.0%> (+100.0%)	⬆️
evalml/tests/pipeline_tests/test_pipeline_utils.py	99.6% <100.0%> (ø)

... and 30 files with indirect coverage changes

[jeremyliweishih]

LGTM

[eccabay]

Just a few nitpicks but otherwise looks great!

[eccabay]

Same question here, why did this have to change?

[christopherbunn]

Previously, our mock didn't actually work. We now check to see that the mock classifier pipelines appear in the results.