Testing: Isolate workshop factories

[islemaster]

Using #29807 as a north-star but I keep trying to do too much, so here's a smaller isolation of our workshop factories before making further usability improvements to them.

[codecov-io]

Codecov Report

Merging #30106 into staging will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           staging   #30106      +/-   ##
===========================================
- Coverage    76.55%   76.48%   -0.07%     
===========================================
  Files          674      681       +7     
  Lines        27515    27668     +153     
===========================================
+ Hits         21064    21163      +99     
- Misses        6451     6505      +54

Impacted Files	Coverage Δ
...llers/api/v1/peer_review_submissions_controller.rb	92% <0%> (-0.86%)	⬇️
dashboard/lib/sqs/queue_processor.rb	24.59% <0%> (ø)
dashboard/lib/sqs/sqs_queue.rb	100% <0%> (ø)
dashboard/lib/sqs/queue_processor_config.rb	100% <0%> (ø)
dashboard/lib/sqs/metrics.rb	46.66% <0%> (ø)
dashboard/lib/sqs/message.rb	66.66% <0%> (ø)
dashboard/lib/sqs/rate_limiter.rb	100% <0%> (ø)
dashboard/lib/sqs/messages_handler.rb	75% <0%> (ø)
lib/cdo/aws/metrics.rb	79.41% <0%> (+32.35%)	⬆️

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