Revert "feat(core): resolve webcrypto from node:crypto for Node18 (#13599)"

[HuiSF]

This reverts commit 37d2627.

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• PR description included
• yarn test passes
• Unit Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

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• Verify E2E tests for existing workflows are working as expected or add E2E tests for newly added workflows
• New source file paths included in this PR have been added to CODEOWNERS, if appropriate

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[github-actions]

⚠️ This PR includes changes to the "aws-amplify" package.json file, which can have library-wide implications.

Please ensure that this PR:

• Does not manually change "@aws-amplify/*" dependency versions, which may misalign core dependencies across the library
• Remove any export paths without a major version bump

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