[DTensor] remove redundant device mesh test code

[XilunWu]

Stack from ghstack (oldest at bottom):

• -> [DTensor] remove redundant device mesh test code #92069
• [DTensor] check DeviceMesh ranks contiguity #91802
• [DTensor] require DeviceMesh size equals world size #91801
• [DTensor] create default process group when absent #91756

[pytorch-bot]

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[XilunWu]

@pytorchmergebot merge -g

[pytorchmergebot]

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Merge failed

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[XilunWu]

@pytorchmergebot merge -g

[pytorchmergebot]

Merge started

Your change will be merged once all checks on your PR pass since you used the green (-g) flag (ETA: 0-4 Hours).

Learn more about merging in the wiki.

Questions? Feedback? Please reach out to the PyTorch DevX Team

Advanced Debugging

Check the merge workflow status
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