azurerm_cognitive_deployment - fix-up partial 4.0 deprecation for changing to supported SKU

[jackofallops]

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Description

This PR fixes up a partially implemented deprecation for the resource that was missed during the major release process.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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Changes to existing Resource / Data Source

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Testing

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Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_cognitive_deployment - hard rename of scale block to sku.

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Closes #27167

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[stephybun]

Thanks @jackofallops LGTM 🐃

[github-actions]

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