fix/12783-error-for-dup-model-name

[gitdallas]

fises: https://issues.redhat.com/browse/RHOAIENG-12783

Description

model name field will check against existing names and give an error help text if it matches one, it will also prevent form submission

How Has This Been Tested?

tested locally by using duplicate model name while trying to register a new model

Test Impact

added a test to check that duplicate model name prevents form submission

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change.

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.89%. Comparing base (c2f8933) to head (63af785).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3708      +/-   ##
==========================================
- Coverage   84.89%   84.89%   -0.01%     
==========================================
  Files        1456     1456              
  Lines       33815    33822       +7     
  Branches     9382     9387       +5     
==========================================
+ Hits        28707    28712       +5     
- Misses       5108     5110       +2     

Files with missing lines	Coverage Δ
...elRegistry/screens/RegisterModel/RegisterModel.tsx	83.72% <100.00%> (+3.16%)	⬆️

... and 4 files with indirect coverage changes

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