Input cleaning take 2

[rowanseymour]

Add InputCollation to envs and have router case tests (including location tests) use envs.CollateEquals

[codecov]

Codecov Report

Merging #1178 (dba3fc1) into main (c3696a4) will increase coverage by 0.00%.
The diff coverage is 90.76%.

@@           Coverage Diff           @@
##             main    #1178   +/-   ##
=======================================
  Coverage   87.81%   87.81%           
=======================================
  Files         259      259           
  Lines       10970    10965    -5     
=======================================
- Hits         9633     9629    -4     
  Misses        918      918           
+ Partials      419      418    -1     

Files Changed	Coverage Δ
flows/field.go	62.34% <33.33%> (ø)
flows/environment.go	84.61% <60.00%> (ø)
envs/locations.go	86.07% <80.00%> (-1.11%)	⬇️
envs/collate.go	100.00% <100.00%> (ø)
envs/environment.go	97.18% <100.00%> (ø)
flows/inputs/msg.go	91.83% <100.00%> (ø)
flows/routers/cases/tests.go	93.75% <100.00%> (-0.07%)	⬇️

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