Remove msgs_msg.response_to_id

[rowanseymour]

Requires nyaruka/rapidpro#3619

[codecov-commenter]

Codecov Report

Merging #56 (e83191b) into main (b45faeb) will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   67.71%   67.83%   +0.12%     
==========================================
  Files           6        6              
  Lines         830      827       -3     
==========================================
- Hits          562      561       -1     
+ Misses        153      152       -1     
+ Partials      115      114       -1     

Impacted Files	Coverage Δ
archives/messages.go	62.41% <ø> (+0.60%)	⬆️

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