SNOW-1232318 fix account name validation

[sfc-gh-knozderko]

Description

SNOW-1232318 Fix account name validation to allow account name be even 1 or 2 chars long

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.25%. Comparing base (7ea8366) to head (6949ae9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #890      +/-   ##
==========================================
+ Coverage   84.14%   84.25%   +0.10%     
==========================================
  Files          88       88              
  Lines        9392     9400       +8     
  Branches      885      886       +1     
==========================================
+ Hits         7903     7920      +17     
+ Misses       1256     1248       -8     
+ Partials      233      232       -1     

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