[backend] Domain observable with hyphen/dash is incorrectly rejected (#8927)

[SarahBocognano]

Proposed changes

• Add hyphen/dash in regex checker

Related issues

• Domain observable with hyphen/dash is incorrectly rejected  #8927

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.30%. Comparing base (ad7bbb2) to head (a57a294).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8929      +/-   ##
==========================================
+ Coverage   66.29%   66.30%   +0.01%     
==========================================
  Files         597      597              
  Lines       61033    61033              
  Branches     6276     6277       +1     
==========================================
+ Hits        40460    40468       +8     
+ Misses      20573    20565       -8     

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