fix gateway branch name validation

[nopcoder]

No description provided.

[ozkatz]

Assiming this section will be refactored soon, LGTM :)

[codecov-io]

Codecov Report

Merging #1024 (28efa7b) into master (d8f2060) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1024   +/-   ##
=======================================
  Coverage   46.24%   46.24%           
=======================================
  Files         152      152           
  Lines       12315    12315           
=======================================
  Hits         5695     5695           
  Misses       5895     5895           
  Partials      725      725           

Impacted Files	Coverage Δ
catalog/mvcc/cataloger_create_repository.go	59.25% <0.00%> (-3.71%)	⬇️
catalog/mvcc/cataloger_create_branch.go	84.61% <0.00%> (+3.07%)	⬆️

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