Extract helper method for repeated form fill in admin/domain_blocks feature spec

[mjankowski]

Dependency of #29139

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (86500e3) 85.01% compared to head (0df7ba1) 85.01%.
Report is 41 commits behind head on main.

Files	Patch %	Lines
app/controllers/api/v1/statuses_controller.rb	87.50%	0 Missing and 1 partial ⚠️
app/controllers/auth/sessions_controller.rb	50.00%	0 Missing and 1 partial ⚠️
app/lib/signature_parser.rb	96.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #29128   +/-   ##
=======================================
  Coverage   85.01%   85.01%           
=======================================
  Files        1059     1060    +1     
  Lines       28277    28295   +18     
  Branches     4538     4535    -3     
=======================================
+ Hits        24040    24056   +16     
- Misses       3074     3075    +1     
- Partials     1163     1164    +1     

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