Bug/duplicate model name

[Ishankoradia]

Fixes DalgoT4D/webapp#1247

Webapp- DalgoT4D/webapp#1250

Dbt model names need to be unique. Fix handles these cases

• When the model is materialized and we go & edit an operation to re-save the model. This action should not allow them to create a model with same name but different schema.
• When there is a separate chain but you try to save the model with the same name (any schema, deosn't matter). This action should not be allowed

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.50%. Comparing base (d98beb8) to head (0709ae6).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
ddpui/api/transform_api.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
- Coverage   69.51%   69.50%   -0.02%     
==========================================
  Files          76       76              
  Lines        7023     7027       +4     
==========================================
+ Hits         4882     4884       +2     
- Misses       2141     2143       +2     

Flag	Coverage Δ
	69.50% <50.00%> (-0.02%)	⬇️

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