fix(subscriptions): Ensure producer is closed on SIGINT and SIGTERM

[lynnagara]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2289 (27423b1) into master (bb441ad) will increase coverage by 0.06%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2289      +/-   ##
==========================================
+ Coverage   92.92%   92.98%   +0.06%     
==========================================
  Files         556      556              
  Lines       25429    25431       +2     
==========================================
+ Hits        23630    23648      +18     
+ Misses       1799     1783      -16     

Impacted Files	Coverage Δ
snuba/cli/subscriptions_scheduler.py	57.77% <33.33%> (-0.37%)	⬇️
snuba/clusters/cluster.py	94.87% <0.00%> (+1.70%)	⬆️
tests/migrations/test_runner_individual.py	100.00% <0.00%> (+1.76%)	⬆️
snuba/migrations/table_engines.py	98.76% <0.00%> (+2.46%)	⬆️
...nsactions_onpremise_fix_orderby_and_partitionby.py	84.00% <0.00%> (+2.66%)	⬆️
...ts/0010_groupedmessages_onpremise_compatibility.py	100.00% <0.00%> (+4.44%)	⬆️
snuba/optimize.py	90.69% <0.00%> (+6.97%)	⬆️
snuba/settings/settings_distributed.py	100.00% <0.00%> (+100.00%)	⬆️
snuba/settings/settings_test_distributed.py	100.00% <0.00%> (+100.00%)	⬆️

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