Arm backend: Replace asserts with error handling in upsample operators

[Sebastian-Larsson]

Update op_upsample_bilinear2d.py and op_upsample_nearest2d.py
classes to replace assert checks with ValueError exceptions for
improved error handling and code robustness.

• Change static shape checks from assertions to conditional raises of
  ValueError for clear runtime error communication.
• Replaced assert checks for int16 range validation of scale_n_yx,
  scale_d_yx, and border_yx with explicit value range checks that
  raise ValueError when bounds are breached.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit e53124b with merge base 12ed924 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-phi-3-mini-runner-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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