Stop setting delete_reason on runs before deletion

[rowanseymour]

Requires nyaruka/rapidpro#3702 be deployed first

[codecov-commenter]

Codecov Report

Merging #63 (e9db46c) into main (43aae95) will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   68.21%   68.34%   +0.12%     
==========================================
  Files           6        6              
  Lines         818      815       -3     
==========================================
- Hits          558      557       -1     
+ Misses        149      148       -1     
+ Partials      111      110       -1     

Impacted Files	Coverage Δ
archives/runs.go	66.23% <ø> (+1.23%)	⬆️

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