[EAGLE-5416] Added Tests for Download checkpoints and Fix download methods

[zeiler]

• Added download checkpoints tests without setting PAT
• remove .cache directory while downloading checkpoints
• Fixed validate_download method: it got broke before because of adding ignore_patterns while downloading checkpoints.
• Handle . as model_path better
• Do less validation if just calling download_checkpoints.
• Fall back to env var HF_TOKEN if not provided in the checkpoints section of config.yaml

[ackizilkale]

Great

[github-actions]

Package	Line Rate	Health
clarifai	43%	❌
clarifai.cli	65%	➖
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	9%	❌
clarifai.runners.models	27%	❌
clarifai.runners.utils	66%	➖
clarifai.schema	100%	✔
clarifai.urls	80%	✔
clarifai.utils	77%	➖
clarifai.utils.evaluation	67%	➖
clarifai.workflows	94%	✔
Summary	64% (4130 / 6492)	➖

Minimum allowed line rate is 50%