[fix] Rename ecrpublic registry policy resource

[johnbarney]

Description

Fix a mistake in resource naming

Motivation and Context

Consistency and my OCD

Breaking Changes

It will cause a delete and create action for users with public repositories deployed. If they happen in the wrong order the policy may be deleted after it is applied. Users would need to apply a second time to ensure their infra is consistent with code.

How Has This Been Tested?

• [X] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [X] I have tested and validated these changes using one or more of the provided examples/* projects
• [ ] I have executed pre-commit run -a on my pull request

[github-actions[bot]]

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