Arm backend: Normalize enum signatures in API manifest

[Sebastian-Larsson]

Normalize Enum subclass signatures in the Arm public API manifest generator so the output stays stable across Python versions.

Use a fixed (*values) signature for enum entries instead of relying on inspect.signature() for EnumMeta.__call__, and update the checked-in manifest snapshot to match.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @robell

[pytorch-bot]

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❌ 1 Cancelled Job, 19 Pending, 32 Unrelated Failures

As of commit 740f5b9 with merge base af90130 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / unittest-release / macos / macos-job (gh)
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BROKEN TRUNK - The following jobs failed but were present on the merge base:

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

• pull / test-lora-linux / linux-job (gh) (trunk failure)
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