Arm backend: Avoid subtraction error on boolean tensors in error diff logging

[fumchin]

This patch add a dtype check before diff calculation to avoid runtime errors since boolean tensors do not support arithmetic operations like subtraction.
Reports the mismatch count for boolean tensors.

for example:

############### ERROR DIFFERENCE ###############
BATCH 0
(BOOLEAN tensor) 0 / 8 elements differ (0.00%)
BATCH 1
(BOOLEAN tensor) 8 / 8 elements differ (100.00%)
BATCH 2
(BOOLEAN tensor) 8 / 8 elements differ (100.00%)
################################################
...
...
AssertionError: Output 0 (bool tensor) does not match reference output.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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As of commit 71a5d01 with merge base 699e73d ():

NEW FAILURE - The following job has failed:

• Apple / build-demo-ios / macos-job (gh)
  Library not loaded: @rpath/liblz4.1.dylib

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[zingo]

Hi @digantdesai this PR touched file outside Arm backend, so we would appreciate a review if OK

[zingo]

Hi @mergennachin this PR touched file outside Arm backend, so we would appreciate a review if OK