[Backport 8.x] Make Inference API task_settings optional

[github-actions]

Backport de300c8 from #2994.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
inference.delete	⚪	Missing test	Missing test
inference.get	🟢	4/4	4/4
inference.inference	⚪	Missing test	Missing test
inference.put	⚪	Missing test	Missing test
inference.stream_inference	🟠	Missing type	Missing type

You can validate these APIs yourself by using the make validate target.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
inference.delete	⚪	Missing test	Missing test
inference.get	🟢	4/4	4/4
inference.inference	⚪	Missing test	Missing test
inference.put	⚪	Missing test	Missing test
inference.stream_inference	🟠	Missing type	Missing type

You can validate these APIs yourself by using the make validate target.