[WIP] Add model config to test fixtures for e5 multilingual model (for PR #533)

[ckadner]

Description

This PR is not meant to be merged into main. It adds tests and fixtures code on top of PR #533 from @maxdebayser

Fix the test test_find_model_by_config:

• Add the e5-multilingual model config to test fixtures for the e5 multilingual model
• Add more distinguishing attributes to known_model_configs.json

Related Issues

#533

[ckadner]

Ah, we need to add more parameters to the know models config file to distinguish between 'BAAI/bge-reranker-large' and 'intfloat/multilingual-e5-large'

 =========================== short test summary info ============================
FAILED tests/utils/test_model_config_validator.py::test_find_model_by_config - AssertionError: assert 2 == 1
 +  where 2 = len(['BAAI/bge-reranker-large', 'intfloat/multilingual-e5-large'])
==== 1 failed, 25 passed, 2 skipped, 552 deselected, 27 warnings in 31.44s =====
sys:1: DeprecationWarning: builtin type swigvarlink has no __module__ attribute
Error: Process completed with exit code 1.

[ckadner]

Passes now:

tests/utils/test_model_config_validator.py::test_find_model_by_config PASSED [ 71%]

[ckadner]

Merged into #533