🎲 random_once router type

[rowanseymour]

Re-adding from #788

[codecov]

Codecov Report

Merging #888 (88c4648) into main (a5ffa94) will decrease coverage by 0.06%.
The diff coverage is 64.51%.

@@            Coverage Diff             @@
##             main     #888      +/-   ##
==========================================
- Coverage   86.56%   86.49%   -0.07%     
==========================================
  Files         237      238       +1     
  Lines       10403    10434      +31     
==========================================
+ Hits         9005     9025      +20     
- Misses        973      980       +7     
- Partials      425      429       +4     

Impacted Files	Coverage Δ
flows/routers/random_once.go	64.51% <64.51%> (ø)

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