[Survey editor] Allow tasks to be conditioned on "Other" response

[rfontanarosa]

closes #2539

[codecov-commenter]

Codecov Report

❌ Patch coverage is 27.27273% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.52%. Comparing base (c972c26) to head (2addde1).

Files with missing lines	Patch %	Lines
...onents/shared/task-editor/task-editor.component.ts	0.00%	4 Missing ⚠️
...sk-condition-form/task-condition-form.component.ts	0.00%	3 Missing ⚠️
web/src/app/converters/survey-data-converter.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2557      +/-   ##
==========================================
- Coverage   62.65%   62.52%   -0.13%     
==========================================
  Files         119      119              
  Lines        2865     2874       +9     
  Branches      427      431       +4     
==========================================
+ Hits         1795     1797       +2     
- Misses       1008     1015       +7     
  Partials       62       62              

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