fix: DeleteSocialAccounts and AddSocialAccounts of UsersService

[Not-Dhananjay-Mishra]

Fixes: #3921
Added an internal struct socialAccountsRequest and use it to send the request body instead of passing accountURLs directly, which previously caused an Invalid input error.
Since the struct is internal and the public method signature remains unchanged, this change introduces no breaking API changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.45%. Comparing base (5dc0050) to head (1f5eb10).
⚠️ Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3922      +/-   ##
==========================================
+ Coverage   92.44%   92.45%   +0.01%     
==========================================
  Files         203      203              
  Lines       14925    14954      +29     
==========================================
+ Hits        13797    13826      +29     
  Misses        926      926              
  Partials      202      202              

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[gmlewis]

Thank you, @Not-Dhananjay-Mishra!
Just a couple minor tweaks, please, then we should be ready for a second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @zyfy29

[gmlewis]

Thank you, @Not-Dhananjay-Mishra and @alexandear!
LGTM.
Merging.