Make sure bench connector never writes more events that it should

[mfelsche]

when iters is configured.

Pull request

Description

Related

Checklist

• The RFC, if required, has been submitted and approved
• Any user-facing impact of the changes is reflected in docs.tremor.rs
• The code is tested
• Use of unsafe code is reasoned about in a comment
• Update CHANGELOG.md appropriately, recording any changes, bug fixes, or other observable changes in behavior
• The performance impact of the change is measured (see below)

Performance

[Licenser]

🚀

[codecov]

Codecov Report

Merging #1662 (9e9d0ae) into main (244fb0e) will increase coverage by 0.04%.
The diff coverage is 91.83%.

@@            Coverage Diff             @@
##             main    #1662      +/-   ##
==========================================
+ Coverage   87.51%   87.56%   +0.04%     
==========================================
  Files         254      254              
  Lines       50203    50210       +7     
==========================================
+ Hits        43937    43968      +31     
+ Misses       6266     6242      -24     

Flag	Coverage Δ
clicommand	14.40% <0.00%> (-0.01%)	⬇️
cliintegration	52.65% <34.69%> (+0.08%)	⬆️
cliunit	13.43% <0.00%> (-0.01%)	⬇️
unittests	86.29% <91.83%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/connectors/impls/bench.rs	85.28% <91.83%> (+0.31%)	⬆️
src/connectors/utils/metrics.rs	92.39% <0.00%> (-2.18%)	⬇️
src/connectors/impls/kafka/producer.rs	74.36% <0.00%> (-0.73%)	⬇️
tremor-value/src/value.rs	99.08% <0.00%> (+0.09%)	⬆️
src/system/flow.rs	90.39% <0.00%> (+0.18%)	⬆️
src/pipeline.rs	86.94% <0.00%> (+0.27%)	⬆️
tremor-value/src/serde/value/de.rs	66.14% <0.00%> (+0.31%)	⬆️
src/connectors.rs	87.71% <0.00%> (+0.46%)	⬆️
src/connectors/impls/ws/server.rs	95.16% <0.00%> (+0.53%)	⬆️
... and 3 more

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[darach]

LGTM 👍