Revert "feat: Errors migration (#1801)"

[lynnagara]

This reverts commit efc62e8.

Reverting until getsentry/self-hosted#920 is also ready
to be merged otherwise the onpremise e2e test will not pass.

[codecov-io]

Codecov Report

Merging #1802 (ca0faad) into master (5109139) will increase coverage by 0.02%.
The diff coverage is 94.86%.

@@            Coverage Diff             @@
##           master    #1802      +/-   ##
==========================================
+ Coverage   90.84%   90.86%   +0.02%     
==========================================
  Files         486      488       +2     
  Lines       22007    22102      +95     
==========================================
+ Hits        19992    20083      +91     
- Misses       2015     2019       +4     

Impacted Files	Coverage Δ
snuba/cli/cleanup.py	0.00% <0.00%> (ø)
snuba/datasets/entities/discover.py	95.90% <ø> (ø)
snuba/datasets/entities/transactions.py	100.00% <ø> (ø)
snuba/migrations/groups.py	93.75% <ø> (ø)
snuba/query/snql/parser.py	94.66% <ø> (ø)
snuba/settings_docker.py	0.00% <0.00%> (ø)
snuba/settings_test.py	100.00% <ø> (ø)
tests/datasets/test_discover.py	100.00% <ø> (ø)
tests/datasets/test_transaction_processor.py	98.50% <ø> (ø)
tests/fixtures.py	100.00% <ø> (ø)
... and 33 more

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