Arm backend: Move rescales from MUL visitor to pass

[martinlsm]

Some TOSA ops do not support INT8 as inputs and outputs. Instead, only
INT32 is supported as a whole number type. Prior to this patch, the MUL
node visitor inserted rescale ops between the data types INT8 and INT32
before and after the operator such that it will accept its input and
output.

Change this by moving the insertion of the rescale ops to the pass
InsertRescaleInt32Pass. This will further enable optimizations
to the graph by fusing the rescale nodes.

Test plan

Test coverage is found the modified test_insert_rescale_i32_pass.py.

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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❌ 3 New Failures, 1 Pending, 3 Unrelated Failures

As of commit 21876ea with merge base 57a7903 ():

NEW FAILURES - The following jobs have failed:

• Lint / android-java-format / linux-job (gh)
  RuntimeError: Command docker exec -t 9161014e14a4b61db5e6329ef51fec1e223c2be3d2178f4f8a1bbcebdf579dde /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2dbd562ea6c784ce79205900966658eed27165602eb2c5320075ef837096dddc /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t 6232fab40dc59a739f944defc9e9fd7175015dd4c38fb0408aaa3a54c7b6af56 /exec failed with exit code 2

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  runtime/test/test_runtime_etdump_gen.py::RuntimeETDumpGenTest::test_etdump_params_with_bytes_and_buffer
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  runtime/test/test_runtime_etdump_gen.py::RuntimeETDumpGenTest::test_etdump_params_with_bytes_and_buffer
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  runtime/test/test_runtime_etdump_gen.py::RuntimeETDumpGenTest::test_etdump_params_with_bytes_and_buffer

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[martinlsm]

@pytorchbot label ciflow/trunk

[martinlsm]

@pytorchbot label "partner: arm"

[Sebastian-Larsson]

Unrelated CI failures