Fix error_inputs for linalg.lstsq; assert SampleInput args are tuple (#83004)
Similar to #82984, this PR fixes the error inputs for linalg.lstsq.
It also also asserts that SampleInput's args must be a
tuple and kwargs (after handling None) must be a dict, and fixes one
other sample input.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83004
Approved by: https://github.com/Chillee
