Use real metrics factory instead of NullFactory

[yurishkuro]

Which problem is this PR solving?

• Some components were still using metrics.NullFactory

Description of the changes

• Create real factory from OTEL MetricsProvider

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.41%. Comparing base (600d82c) to head (50b1922).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6261      +/-   ##
==========================================
- Coverage   96.44%   96.41%   -0.03%     
==========================================
  Files         355      355              
  Lines       20155    20156       +1     
==========================================
- Hits        19438    19434       -4     
- Misses        528      532       +4     
- Partials      189      190       +1     

Flag	Coverage Δ
badger_v1	8.31% <ø> (ø)
badger_v2	1.67% <ø> (ø)
cassandra-4.x-v1	14.39% <ø> (ø)
cassandra-4.x-v2	1.61% <ø> (ø)
cassandra-5.x-v1	14.39% <ø> (ø)
cassandra-5.x-v2	1.61% <ø> (ø)
elasticsearch-6.x-v1	18.60% <ø> (+<0.01%)	⬆️
elasticsearch-7.x-v1	18.68% <ø> (ø)
elasticsearch-8.x-v1	18.85% <ø> (+<0.01%)	⬆️
elasticsearch-8.x-v2	1.67% <ø> (+<0.01%)	⬆️
grpc_v1	9.43% <ø> (-0.01%)	⬇️
grpc_v2	6.98% <ø> (ø)
kafka-v1	8.88% <ø> (ø)
kafka-v2	1.67% <ø> (ø)
memory_v2	1.66% <ø> (-0.01%)	⬇️
opensearch-1.x-v1	18.73% <ø> (ø)
opensearch-2.x-v1	18.73% <ø> (+<0.01%)	⬆️
opensearch-2.x-v2	1.67% <ø> (ø)
tailsampling-processor	0.46% <ø> (ø)
unittests	95.33% <100.00%> (-0.03%)	⬇️

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