add back pretrainedmodelconfig

[zeiler]

For some reason handling the mcp model type isn't working in API, but text-to-text without this pretrained model config also isn't working. So for now adding it back to text-to-text works.

[github-actions]

Package	Line Rate	Health
clarifai	43%	❌
clarifai.cli	41%	❌
clarifai.client	71%	➖
clarifai.client.auth	74%	➖
clarifai.constants	100%	✔
clarifai.datasets	100%	✔
clarifai.datasets.export	80%	✔
clarifai.datasets.upload	75%	➖
clarifai.datasets.upload.loaders	37%	❌
clarifai.models	100%	✔
clarifai.modules	0%	❌
clarifai.rag	72%	➖
clarifai.runners	12%	❌
clarifai.runners.models	61%	➖
clarifai.runners.utils	56%	➖
clarifai.runners.utils.data_types	72%	➖
clarifai.schema	100%	✔
clarifai.urls	58%	➖
clarifai.utils	73%	➖
clarifai.utils.evaluation	67%	➖
clarifai.workflows	94%	✔
Summary	65% (6295 / 9732)	➖

Minimum allowed line rate is 50%