fix: optional unauthorized status codes

[dpgaspar]

Description

ADDITIONAL INFORMATION

• Has associated issue:
• Is CRUD MVC related.
• Is Auth, RBAC security related.
• Changes the security db schema.
• Introduces new feature
• Removes existing feature

[codecov]

Codecov Report

Merging #1753 (9932b64) into master (0706abe) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1753      +/-   ##
==========================================
+ Coverage   76.78%   76.88%   +0.10%     
==========================================
  Files          56       56              
  Lines        8131     8136       +5     
==========================================
+ Hits         6243     6255      +12     
+ Misses       1888     1881       -7     

Flag	Coverage Δ
python	76.88% <100.00%> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
flask_appbuilder/security/decorators.py	93.33% <100.00%> (+5.09%)	⬆️
flask_appbuilder/security/manager.py	75.91% <0.00%> (+0.32%)	⬆️

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