Relax adaptive sampling dependency on sampler tags

[yurishkuro]

Which problem is this PR solving?

• Part of Adaptive sampling does not work with OTEL SDKs #6700

Description of the changes

• Introduce an opt-in option to allow the engine to operate without sampler tags

How was this change tested?

• TBD

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.08%. Comparing base (9d1e94c) to head (60d171a).
⚠️ Report is 253 commits behind head on main.

Files with missing lines	Patch %	Lines
...pling/samplingstrategy/adaptive/post_aggregator.go	66.66%	2 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (78.57%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6692      +/-   ##
==========================================
- Coverage   96.14%   96.08%   -0.07%     
==========================================
  Files         358      358              
  Lines       21584    21582       -2     
==========================================
- Hits        20752    20736      -16     
- Misses        627      637      +10     
- Partials      205      209       +4     

Flag	Coverage Δ
badger_v1	9.91% <ø> (ø)
badger_v2	2.05% <ø> (ø)
cassandra-4.x-v1-manual	14.91% <ø> (ø)
cassandra-4.x-v2-auto	2.04% <ø> (ø)
cassandra-4.x-v2-manual	2.04% <ø> (ø)
cassandra-5.x-v1-manual	14.91% <ø> (ø)
cassandra-5.x-v2-auto	2.04% <ø> (ø)
cassandra-5.x-v2-manual	2.04% <ø> (ø)
elasticsearch-6.x-v1	20.17% <ø> (ø)
elasticsearch-7.x-v1	20.25% <ø> (ø)
elasticsearch-8.x-v1	20.43% <ø> (ø)
elasticsearch-8.x-v2	2.05% <ø> (ø)
grpc_v1	11.46% <ø> (ø)
grpc_v2	2.05% <ø> (ø)
kafka-3.x-v1	10.19% <ø> (ø)
kafka-3.x-v2	2.05% <ø> (ø)
memory_v2	2.05% <ø> (ø)
opensearch-1.x-v1	20.30% <ø> (ø)
opensearch-2.x-v1	20.30% <ø> (ø)
opensearch-2.x-v2	2.05% <ø> (ø)
query	2.05% <ø> (ø)
tailsampling-processor	0.55% <ø> (ø)
unittests	94.88% <78.57%> (-0.07%)	⬇️

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[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. You may re-open it if you need more time.

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. You may re-open it if you need more time.