[refactor] Use plain loops with iterators

[yurishkuro]

Description of the changes

• Follow-up to Use stdlib iterators #6714

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.03%. Comparing base (0bc62de) to head (ddfbbb4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6722      +/-   ##
==========================================
- Coverage   96.03%   96.03%   -0.01%     
==========================================
  Files         364      364              
  Lines       20691    20675      -16     
==========================================
- Hits        19871    19855      -16     
  Misses        626      626              
  Partials      194      194              

Flag	Coverage Δ
badger_v1	9.76% <ø> (ø)
badger_v2	1.82% <ø> (ø)
cassandra-4.x-v1-manual	14.81% <ø> (ø)
cassandra-4.x-v2-auto	1.81% <ø> (ø)
cassandra-4.x-v2-manual	1.81% <ø> (ø)
cassandra-5.x-v1-manual	14.81% <ø> (ø)
cassandra-5.x-v2-auto	1.81% <ø> (ø)
cassandra-5.x-v2-manual	1.81% <ø> (ø)
elasticsearch-6.x-v1	19.15% <ø> (ø)
elasticsearch-7.x-v1	19.23% <ø> (ø)
elasticsearch-8.x-v1	19.40% <ø> (ø)
elasticsearch-8.x-v2	1.82% <ø> (ø)
grpc_v1	10.81% <ø> (ø)
grpc_v2	7.80% <ø> (ø)
kafka-3.x-v1	10.13% <ø> (ø)
kafka-3.x-v2	1.82% <ø> (ø)
memory_v2	1.82% <ø> (ø)
opensearch-1.x-v1	19.28% <ø> (ø)
opensearch-2.x-v1	19.28% <ø> (ø)
opensearch-2.x-v2	1.82% <ø> (ø)
tailsampling-processor	0.48% <ø> (ø)
unittests	94.92% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jkowall]

LGTM!