backend: add new Cohere Platform models to seeder

[tianjing-li]

This pull request introduces changes to two files, src/backend/database_models/seeders/deplyments_models_seed.py and src/backend/model_deployments/cohere_platform.py.

src/backend/database_models/seeders/deplyments_models_seed.py

This file undergoes the following modifications:

• Addition of four new dictionaries: "c4ai-aya-23-35b", "command-r-08-2024", "command-r-plus-08-2024", and "c4ai-aya-23-35b". These dictionaries are nested within the ModelDeploymentName.SingleContainer and ModelDeploymentName.MultiContainer objects.

src/backend/model_deployments/cohere_platform.py

The list_models function is updated to streamline the filtering process by removing unnecessary indentation and simplifying the list comprehension.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.09%. Comparing base (5af71bb) to head (1c11081).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/backend/model_deployments/cohere_platform.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #790      +/-   ##
==========================================
- Coverage   79.80%   79.09%   -0.71%     
==========================================
  Files         240      246       +6     
  Lines       10515    10785     +270     
==========================================
+ Hits         8391     8530     +139     
- Misses       2124     2255     +131     

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