`azurerm_api_management` - remove the requirement that `public_ip_address` must be specified with `zones`

[mbfrahry]

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Description

This PR fixes #16783 by removing the requirement that public_ip_address must be specified with zones. I'm not sure where this requirement came from but I was able to spin up an azurerm_api_management resource with zones and public_ip_address not specified without issue.

PR Checklist

• [x] I have followed the guidelines in our Contributing Documentation.
• [x] I have checked to ensure there aren't other open Pull Requests for the same update/change.
• [x] 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

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• azurerm_api_management - remove the requirement that public_ip_address must be specified with zones [GH-00000]

This is a (please select all that apply):

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

Related Issue(s)

Fixes #0000

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