Bug 1594822 - Remove Autoclassify and Crossreference without migration

[camd]

This is the same code as #6897 but doesn't do the migration. The migration keeps timing out. I will do the migration in a separate step, probably manually via mysql> cli and then mark the migration as completed in the django table by hand.

[codecov-io]

Codecov Report

Merging #6915 (878e8dd) into master (1a7a677) will decrease coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6915      +/-   ##
==========================================
- Coverage   88.22%   87.87%   -0.35%     
==========================================
  Files         289      279      -10     
  Lines       13666    13132     -534     
==========================================
- Hits        12057    11540     -517     
+ Misses       1609     1592      -17     

Impacted Files	Coverage Δ
tests/autoclassify/utils.py	82.69% <ø> (-11.65%)	⬇️
tests/conftest.py	96.02% <ø> (-0.06%)	⬇️
tests/model/test_classified_failure.py	100.00% <ø> (ø)
treeherder/config/settings.py	88.88% <ø> (ø)
treeherder/model/error_summary.py	94.11% <ø> (-1.18%)	⬇️
treeherder/model/models.py	80.52% <ø> (-6.37%)	⬇️
treeherder/webapp/api/jobs.py	82.22% <ø> (-0.20%)	⬇️
... and 1 more

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.87%. Comparing base (1a7a677) to head (878e8dd).
⚠️ Report is 1699 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6915      +/-   ##
==========================================
- Coverage   88.22%   87.87%   -0.35%     
==========================================
  Files         289      279      -10     
  Lines       13666    13132     -534     
==========================================
- Hits        12057    11540     -517     
+ Misses       1609     1592      -17     

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