Turn warning into error for unsupported `allowed_uses` in certificate resources

[detro]

Terraform CLI and Provider Versions

0.12

Use Cases or Problem Statement

Context: #184

Proposal

With a major release of TLS provider, we want to turn the warning introduced for misconfigured allowed_uses into an error.

How much impact is this issue causing?

Low

Additional Information

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

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