ref: Small settings cleanup

[lynnagara]

We no longer emit these metrics

[codecov-commenter]

Codecov Report

Base: 92.30% // Head: 92.31% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (ae5bb9c) compared to base (a77edea).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3251      +/-   ##
==========================================
+ Coverage   92.30%   92.31%   +0.01%     
==========================================
  Files         697      697              
  Lines       31630    31655      +25     
==========================================
+ Hits        29195    29222      +27     
+ Misses       2435     2433       -2     

Impacted Files	Coverage Δ
snuba/settings/__init__.py	95.33% <ø> (-0.07%)	⬇️
snuba/datasets/entities/generic_metrics.py	95.34% <0.00%> (-2.33%)	⬇️
snuba/subscriptions/executor_consumer.py	91.84% <0.00%> (ø)
tests/admin/clickhouse_migrations/test_api.py	100.00% <0.00%> (ø)
snuba/admin/views.py	76.84% <0.00%> (+0.55%)	⬆️
snuba/datasets/entity_subscriptions/factory.py	75.55% <0.00%> (+1.08%)	⬆️
snuba/datasets/pluggable_entity.py	89.65% <0.00%> (+1.72%)	⬆️
snuba/datasets/entities/factory.py	91.89% <0.00%> (+2.55%)	⬆️

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