chore: Remove domains from setup wizard

[deepeshgarg007]

The only visible change to the users will be the below step missing from the setup wizard. After the domain separation from ERPNext this step was obsolete and didn't do much. The domain field in company master has been made data fields so that there is no data loss for the old user migrations

[codecov]

Codecov Report

Merging #30820 (322f0db) into develop (924cf77) will decrease coverage by 0.41%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #30820      +/-   ##
===========================================
- Coverage    63.21%   62.80%   -0.42%     
===========================================
  Files          985      983       -2     
  Lines        67119    67059      -60     
===========================================
- Hits         42429    42116     -313     
- Misses       24690    24943     +253     

Impacted Files	Coverage Δ
erpnext/hooks.py	100.00% <ø> (ø)
...ext/setup/setup_wizard/operations/company_setup.py	61.22% <ø> (ø)
...xt/setup/setup_wizard/operations/defaults_setup.py	0.00% <ø> (ø)
.../setup/setup_wizard/operations/install_fixtures.py	92.85% <ø> (-0.14%)	⬇️
erpnext/setup/setup_wizard/setup_wizard.py	77.41% <ø> (-2.00%)	⬇️
erpnext/setup/utils.py	95.34% <ø> (+1.80%)	⬆️
erpnext/domains/retail.py	0.00% <0.00%> (-100.00%)	⬇️
erpnext/domains/services.py	0.00% <0.00%> (-100.00%)	⬇️
erpnext/domains/distribution.py	0.00% <0.00%> (-100.00%)	⬇️
erpnext/domains/manufacturing.py	0.00% <0.00%> (-100.00%)	⬇️
... and 37 more