feat(aws sinks): validate config at compile time

[thomasqueirozb]

Summary

Refactor AWS sinks to validate config up front via the validated-config pattern, including header validation, and make ssekms_key_id respect the configured timezone.

References

NA

Vector configuration

NA

How did you test this PR?

NA

Is this a breaking change?

• Yes
• No

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• No. A maintainer will apply the no-changelog label to this PR.

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[thomasqueirozb]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🚀

Reviewed commit: cd83afc2fd

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