add cron to clear stucked ivr call channel connection

[rasoro]

added a cron to "clean up" stucked ivr call channel connection (more than 1 day active, which should have been updated by provider callback),
this cron runs every 1 hour and on each run it can "clean up" to 100 channel connections.

[codecov-commenter]

Codecov Report

Merging #65 (231a30b) into main (f2f9310) will decrease coverage by 0.14%.
The diff coverage is 41.37%.

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
- Coverage   58.35%   58.20%   -0.15%     
==========================================
  Files         128      128              
  Lines        9146     9202      +56     
==========================================
+ Hits         5337     5356      +19     
- Misses       2984     3013      +29     
- Partials      825      833       +8     

Impacted Files	Coverage Δ
core/tasks/ivr/cron.go	31.81% <41.37%> (+1.55%)	⬆️

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