[Torch] Added tests in test_forward_linear

[padreofthegame]

Since the fixes in matmul operator are merged, this PR should complete the coverage of test cases for torch.nn.functional.linear function marked as TODO in test_forward.py file:

TODO: Add the following cases when matmul(1D, _) is supported by TVM

• 1D input, 2D weight, 1D bias
• 1D input, 2D weight, no bias
• 1D input, 1D weight, scalar bias
• 1D input, 1D weight, no bias

[tvm-bot]

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• cc @shingjan, @yelite _{See #10317 for details}

_{Generated by tvm-bot}

[shingjan]

LGTM. @masahi

[masahi]

@tvm-bot rerun