controllers/token: Move name check outside of spawn_blocking() callback

[Turbo87]

There is no need to spin up a worker thread for basic data validation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.06%. Comparing base (2e5a4fe) to head (89b8ce9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9574      +/-   ##
==========================================
- Coverage   89.07%   89.06%   -0.01%     
==========================================
  Files         286      286              
  Lines       28940    28938       -2     
==========================================
- Hits        25779    25775       -4     
- Misses       3161     3163       +2     

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