[YUNIKORN-2656] Validate user name

[manirajv06]

What is this PR for?

username specified as part of app submission also need to follow validation process already carried out for username specified in limit settings.

What type of PR is it?

• - Feature

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2656

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[pbacsko]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.63%. Comparing base (66e2072) to head (3c53404).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #889      +/-   ##
==========================================
+ Coverage   77.42%   77.63%   +0.20%     
==========================================
  Files          97       97              
  Lines       12132    12119      -13     
==========================================
+ Hits         9393     9408      +15     
+ Misses       2411     2388      -23     
+ Partials      328      323       -5     

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