Replace logrus with slog in rapidpro backend

[norkans7]

No description provided.

[codecov]

Codecov Report

Merging #658 (56a4ad4) into main (06241fe) will decrease coverage by 0.01%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main     #658      +/-   ##
==========================================
- Coverage   74.04%   74.04%   -0.01%     
==========================================
  Files         100      100              
  Lines       13179    13177       -2     
==========================================
- Hits         9759     9757       -2     
  Misses       2732     2732              
  Partials      688      688              

Files	Coverage Δ
handlers/test.go	0.00% <0.00%> (ø)
backends/rapidpro/channel_event.go	50.86% <0.00%> (ø)
backends/rapidpro/msg.go	68.24% <0.00%> (ø)
backends/rapidpro/urn.go	73.24% <0.00%> (ø)
backends/rapidpro/channel_log.go	75.78% <42.85%> (ø)
backends/rapidpro/contact.go	46.78% <0.00%> (ø)
backends/rapidpro/backend.go	69.08% <69.56%> (-0.10%)	⬇️
backends/rapidpro/status.go	60.86% <12.50%> (ø)

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