fix(dynamic-sampling): use options instead of feature flags for switching b/w span and transaction based rebalancing

[shellmayr]

• Use an option with a list of orgs instead of feature flags because it's faster
• Should be in-memory and therefore significantly faster than feature flags
• We can do this because we do not expect large quantities of orgs to be added to this
• Previous batch-checking solution had high performance penalty despite multiple optimizations

Contributes to TET-1147

[linear]

TET-1147 Verify Functionality of Dynamic Sampling on AM3

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 6 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/core/endpoints/organization_details.py	25.00%	3 Missing ⚠️
...ynamic_sampling/tasks/boost_low_volume_projects.py	76.92%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #102576      +/-   ##
===========================================
+ Coverage   80.72%    80.91%   +0.19%     
===========================================
  Files        8939      8939              
  Lines      391181    391178       -3     
  Branches    24883     24883              
===========================================
+ Hits       315781    316523     +742     
+ Misses      75030     74285     -745     
  Partials      370       370              

[getsentry-bot]

PR reverted: 66f92d0

[shellmayr]

Reverted this because the jobs seemed to not cause things to get rebalanced anymore, some of the metrics were off.