Handle same tensor appearing multiple times in the cat input

[ethansfng]

Summary: GenerateCatNopConstraints pass in memory planning was crashing when the same tensor appeared multiple times in a single cat operation's input list at different positions.

Differential Revision: D88439174

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit c659034 with merge base 37b9041 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / android / run-emulator (gh) (trunk failure)
  Timeout waiting for emulator to boot.

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[meta-codesync]

@ethansfng has exported this pull request. If you are a Meta employee, you can view the originating Diff in D88439174.

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