Delete predict_uses_y

[freddyaboulton]

Pull Request Description

Fixes #2961

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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 #3069 (1aea944) into main (3e00450) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #3069     +/-   ##
=======================================
+ Coverage   99.8%   99.8%   +0.1%     
=======================================
  Files        312     312             
  Lines      30240   30232      -8     
=======================================
- Hits       30150   30144      -6     
+ Misses        90      88      -2     

Impacted Files	Coverage Δ
...valml/pipelines/components/estimators/estimator.py	100.0% <ø> (ø)
...ators/regressors/time_series_baseline_estimator.py	100.0% <ø> (ø)
.../pipelines/time_series_classification_pipelines.py	100.0% <100.0%> (+1.1%)	⬆️
evalml/pipelines/time_series_pipeline_base.py	100.0% <100.0%> (+1.0%)	⬆️
.../tests/pipeline_tests/test_time_series_pipeline.py	99.8% <100.0%> (ø)

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[angela97lin]

This looks good to me, glad that we're able to simplify things even more :)

I still see a reference to it in docs/source/_templates/estimator_class.rst that we'll probably want to remove too?

   {% block attributes %}
   .. Class attributes:
   .. autoattribute:: name
   .. autoattribute:: model_family
   .. autoattribute:: supported_problem_types
   .. autoattribute:: hyperparameter_ranges
   .. autoattribute:: default_parameters
   .. autoattribute:: predict_uses_y
   {% endblock %}

[freddyaboulton]

@angela97lin Done!