Preserve _ESTIMATOR_FAMILY_ORDER in IterativeAlgorithm

[freddyaboulton]

Pull Request Description

Fixes #2849

Controversial perf tests here: https://alteryx.atlassian.net/wiki/spaces/PS/pages/1061093724/2849+Preserve+Pipeline+Order 😂

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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 #2850 (ce12981) into main (21aca40) will increase coverage by 0.8%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #2850     +/-   ##
=======================================
+ Coverage   99.0%   99.7%   +0.8%     
=======================================
  Files        302     302             
  Lines      28626   28637     +11     
=======================================
+ Hits       28315   28544    +229     
+ Misses       311      93    -218     

Impacted Files	Coverage Δ
...lml/automl/automl_algorithm/iterative_algorithm.py	100.0% <ø> (ø)
evalml/automl/automl_search.py	99.9% <100.0%> (+0.2%)	⬆️
evalml/tests/automl_tests/test_automl.py	99.5% <100.0%> (+0.1%)	⬆️
...lml/tests/automl_tests/test_iterative_algorithm.py	100.0% <100.0%> (+5.4%)	⬆️
evalml/automl/utils.py	100.0% <0.0%> (+1.7%)	⬆️
evalml/tests/automl_tests/test_automl_utils.py	100.0% <0.0%> (+9.5%)	⬆️
.../automl_tests/test_automl_search_classification.py	100.0% <0.0%> (+10.6%)	⬆️
... and 3 more

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[freddyaboulton]

Perf tests have been updated with results from a new default model family order.

[bchen1116]

LGTM! I'm fine with changing the order to get generally-better model performance. I left a comment on removing the excess commented code, but the implementation looks great!

[bchen1116]

Should these comments be removed?

[chukarsten]

I think we should hold off on this one....

[freddyaboulton]

Sounds good @chukarsten ! When do you think would be a good time to merge this?

[chukarsten]

Cool, cool. I think we can move forward with this. Are you intending to keep those commented if clauses? I think just tidy that up and we're gucci.

[freddyaboulton]

@alteryx/evalml I re-ran the perf tests after merging in the latest main since it had been a while. Results from the previous analysis still hold. Anyone have any thoughts before I merge later today or tomorrow?