Update manual CI workflows to take commit SHA (#4078)

## Motivation and Context
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## Description
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## Testing
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Canary fails with appropriate error message if provided SHA and
retrieved SHA (from the PR number) don't match:
https://github.com/smithy-lang/smithy-rs/actions/runs/14210739747

Canary works if the provided SHA and the retrieved SHA do match:
https://github.com/smithy-lang/smithy-rs/actions/runs/14210752482

Manual PR bot fails with appropriate error message if provided SHA and
retrieved SHA do not match:
https://github.com/smithy-lang/smithy-rs/actions/runs/14210797894

Manual PR bot works if the provided SHA and retrieved SHA do match:
https://github.com/smithy-lang/smithy-rs/actions/runs/14210813156

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