fix: error handling - pull remote models list raise an error on fail

[louis-menlo]

This pull request includes changes to the extensions/engine-management-extension/src/index.ts file to rename a class and improve the handling of remote models.

In the latest beta version, users will need to delete the engine and then add it back to have the /models pulled. Instead, with this update, users will only need to update the /models endpoint to trigger the models pull.

Class renaming:

• extensions/engine-management-extension/src/index.ts: Renamed JSONEngineManagementExtension to JanEngineManagementExtension to better reflect its functionality.

Handling of remote models:

• extensions/engine-management-extension/src/index.ts: Updated the updateEngine method to call populateRemoteModels after posting the engine configuration to ensure remote models are populated.
• extensions/engine-management-extension/src/index.ts: Modified the getRemoteModels method to use safe navigation (?.) when mapping models to handle cases where data might be undefined.

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Barecheck - Code coverage report

Total: 67.74%

Your code coverage diff: 0.00% ▴

✅ All code changes are covered

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[louis-menlo]

Another thought, it would spam default remote engines models list. On-hold for now.