Don't fail user creation if org exists

[pat-s]

fix #4651

Also modified OrgFindByName to return nil if nothing is found instead of erroring with a SQL error.

[codecov]

Codecov Report

Attention: Patch coverage is 52.17391% with 11 lines in your changes missing coverage. Please review.

Project coverage is 28.18%. Comparing base (d022bf2) to head (ffcc47e).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
server/store/datastore/user.go	46.66%	6 Missing and 2 partials ⚠️
server/store/datastore/org.go	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4687   +/-   ##
=======================================
  Coverage   28.17%   28.18%           
=======================================
  Files         398      398           
  Lines       28231    28245   +14     
=======================================
+ Hits         7954     7960    +6     
- Misses      19571    19575    +4     
- Partials      706      710    +4     

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[woodpecker-bot]

Tearing down https://woodpecker-ci-woodpecker-pr-4687.surge.sh

[pat-s]

💚 All backports created successfully

Status	Branch	Result
✅	release/v2.8

Questions ?

Please refer to the Backport tool documentation