ensure qparams match for slices

[JakeStevens]

Summary:
Currently, a quantized slice fails at runtime if its input qparams differ from the output.

Here, we add a check to the partitioner to ensure they match, otherwise we fall back portable ops.

This quickly addresses:

#21829

while a better, annotator-based fix is implemented.

Differential Revision: D116618462

[pytorch-bot]

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❌ 2 New Failures, 1 Unrelated Failure

As of commit b454b04 with merge base d827cf7 ():

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[meta-codesync]

@JakeStevens has exported this pull request. If you are a Meta employee, you can view the originating Diff in D116618462.

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