Skip email domain validation for shared user creation

[HasiniSama]

Purpose

Fixes: wso2/product-is#21466

Goals

When creating a sub-organization, the root organization's user is shared within the sub-organization. However, if the domain of the root user is already associated with another sub-organization, user creation fails due to a domain validation error. This validation is not necessary for shared users.

Approach

Remove the domain validation for users when the user is created as either the root tenant admin or an invited user from the parent organization. This can be achieved by checking the managed-by claim of the user.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.03%. Comparing base (f389c4b) to head (706acfb).
Report is 13 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##               main     #405       +/-   ##
=============================================
- Coverage     41.53%   26.03%   -15.51%     
- Complexity      218      346      +128     
=============================================
  Files            30       50       +20     
  Lines          1678     4145     +2467     
  Branches        187      478      +291     
=============================================
+ Hits            697     1079      +382     
- Misses          938     2984     +2046     
- Partials         43       82       +39     

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