Revert "feat(graphQL): support list users by email"

[wsxiaoys]

Reverts #3529

revert if #3530 goes to join user_id directly

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.03%. Comparing base (0a57a66) to head (5657858).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
ee/tabby-schema/src/schema/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3532      +/-   ##
==========================================
- Coverage   63.26%   63.03%   -0.24%     
==========================================
  Files         197      197              
  Lines       22669    22523     -146     
==========================================
- Hits        14342    14197     -145     
+ Misses       8327     8326       -1     

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