Revert "Bug 1851253 - store new failure lines in database for persistent stor…"

[Archaeopteryx]

Reverts #7818 because the bug_suggestions API endpoint can return an internal server error.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (fb769de) 76.79% compared to head (cd7fc15) 76.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7834      +/-   ##
==========================================
+ Coverage   76.79%   76.86%   +0.07%     
==========================================
  Files         538      538              
  Lines       26583    26575       -8     
  Branches     3359     3359              
==========================================
+ Hits        20414    20427      +13     
+ Misses       6004     5983      -21     
  Partials      165      165              

Files	Coverage Δ
tests/test_setup.py	100.00% <100.00%> (ø)
treeherder/config/settings.py	88.80% <ø> (+0.79%)	⬆️
treeherder/model/error_summary.py	90.85% <100.00%> (-1.32%)	⬇️
treeherder/webapp/api/note.py	76.47% <66.66%> (-0.35%)	⬇️

... and 10 files with indirect coverage changes

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