Remove chatbase support

[rowanseymour]

[codecov]

Codecov Report

Merging #388 (7d49998) into main (0ae35b6) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   71.42%   71.36%   -0.07%     
==========================================
  Files          94       93       -1     
  Lines        8276     8255      -21     
==========================================
- Hits         5911     5891      -20     
  Misses       1762     1762              
+ Partials      603      602       -1     

Impacted Files	Coverage Δ
backends/rapidpro/backend.go	61.60% <ø> (-0.63%)	⬇️
backends/rapidpro/channel.go	40.28% <0.00%> (-0.72%)	⬇️

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