Cortex-M quantizer: Use is_int8_activations helper in remaining checkers

[psiddh]

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[pytorch-bot]

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❌ 2 New Failures, 2 Cancelled Jobs, 2 Unrelated Failures

As of commit aadfb88 with merge base 02fe862 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 1fdd081d195c52b5c4706c092f5d31115c9d6d29c1d2ff9060f63ded86daa7cb /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 05f829ca4099ba743bfc9c39aacd149edb5c73b44e758a4fdd508f8505f0b8c5 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-samsung-models-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  ##[error]The operation was canceled.

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

• pull / unittest / macos / macos-job (gh) (similar failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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

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

• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[Copilot]

Pull request overview

This PR refactors Cortex-M quantizer pattern checkers to consistently use the shared is_int8_activations helper when validating activation dtypes, reducing duplicated logic in quantization-config checks.

Changes:

• Replaced inline int8 dtype checks in CortexMAddMulCheck.check_quantization_config with cls.is_int8_activations(...).
• Replaced inline int8 dtype checks in CortexMLinearCheck.check_quantization_config with cls.is_int8_activations(...).

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