feat(mep): add new subscription-related generic-metrics topics

[onewland]

scheduled-* is needed to deploy the scheduler

*-results will be needed to deploy the executor

[codecov-commenter]

Codecov Report

Merging #2935 (3eb0703) into master (5d9755c) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2935      +/-   ##
==========================================
- Coverage   92.93%   92.87%   -0.07%     
==========================================
  Files         635      635              
  Lines       29069    29073       +4     
==========================================
- Hits        27016    27002      -14     
- Misses       2053     2071      +18     

Impacted Files	Coverage Δ
snuba/settings/validation.py	71.87% <ø> (ø)
snuba/utils/streams/topics.py	100.00% <100.00%> (ø)
snuba/settings/settings_distributed.py	0.00% <0.00%> (-100.00%)	⬇️
snuba/settings/settings_test_distributed.py	0.00% <0.00%> (-100.00%)	⬇️
...ts/0010_groupedmessages_onpremise_compatibility.py	95.55% <0.00%> (-4.45%)	⬇️
snuba/optimize.py	87.50% <0.00%> (-3.75%)	⬇️
snuba/migrations/table_engines.py	95.50% <0.00%> (-3.38%)	⬇️
...nsactions_onpremise_fix_orderby_and_partitionby.py	81.33% <0.00%> (-2.67%)	⬇️
tests/migrations/test_runner_individual.py	91.20% <0.00%> (-2.20%)	⬇️
snuba/clusters/cluster.py	94.92% <0.00%> (-1.45%)	⬇️

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