[xpu][test] Port 2 test/dtypes_{floatx, bitpacking} UT files to intel XPU

[zxd1997066]

For https://github.com/pytorch/ao/issues/2917, This PR is targeted to port test/dtypes/test_floatx.py and test/dtypes/test_bitpacking.py to intel XPU.

[pytorch-bot[bot]]

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As of commit b6a2c80bcf2d7493a2cdc747ab0ef94ab9062d55 with merge base 257d18ae1b41e8bd8d85849dd2bd43ad3885678e (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[zxd1997066]

cc @liangan1

[pytorch-bot[bot]]

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[pytorch-bot[bot]]

To add the ciflow label ciflow/xpu please first approve the workflows that are awaiting approval (scroll to the bottom of this page).

This helps ensure we don't trigger CI on this PR until it is actually authorized to do so. Please ping one of the reviewers if you do not have access to approve and run workflows.