Swap is_multiseries logic to problem type

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[codecov]

Codecov Report

Merging #4278 (0a0edbb) into 4266_msts_search (9f3cb79) will decrease coverage by 15.0%.
The diff coverage is 65.4%.

@@                 Coverage Diff                 @@
##           4266_msts_search   #4278      +/-   ##
===================================================
- Coverage              99.7%   84.7%   -15.0%     
===================================================
  Files                   355     355              
  Lines                 39067   39065       -2     
===================================================
- Hits                  38946   33050    -5896     
- Misses                  121    6015    +5894     

Files Changed	Coverage Δ
...lml/automl/automl_algorithm/iterative_algorithm.py	80.9% <ø> (-16.5%)	⬇️
evalml/automl/utils.py	81.1% <ø> (-16.2%)	⬇️
evalml/pipelines/components/component_base.py	100.0% <ø> (ø)
...sors/multiseries_time_series_baseline_regressor.py	100.0% <ø> (ø)
evalml/problem_types/__init__.py	100.0% <ø> (ø)
evalml/tests/automl_tests/test_automl.py	0.0% <0.0%> (-99.4%)	⬇️
evalml/tests/automl_tests/test_automl_utils.py	0.0% <0.0%> (-100.0%)	⬇️
...valml/tests/automl_tests/test_default_algorithm.py	0.0% <0.0%> (-100.0%)	⬇️
...lml/tests/automl_tests/test_iterative_algorithm.py	0.0% <0.0%> (-100.0%)	⬇️
evalml/tests/component_tests/test_utils.py	99.3% <ø> (ø)
... and 18 more

... and 25 files with indirect coverage changes