chore(ci): remove redundant corepack enable

[trivikr]

Issue

The command corepack enable is not required to be run for after globally installing corepack
https://www.github.com/nodejs/corepack/issues/104#issuecomment-2746172451

Description

Removes redundant command corepack enable

Testing

CI

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[trivikr]

Corepack installation needs to be before action/setup-node, else it doesn't use yarn version from devEngines field.

Noticed in https://github.com/aws/aws-sdk-js-codemod/actions/runs/14052278544/job/39344738905?pr=979

[github-actions]

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