azurerm_management_group_policy_assignment - Remove unnecessary length validation of resource name

[marevers]

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Description

The azure_management_group_policy_assignment resource currently limits the resource name length to 24 characters. However, on the Azure side / in the Azure portal, there is no such limitation. A name of 24 characters severely limits the descriptiveness of the name and as such, it is hard to properly name the assignment considering that limitation.

It is assumed that this might have once been a limitation on the Azure side but as this limitation does not exist (anymore), this PR removes the limitation.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
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Changes to existing Resource / Data Source

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Change Log

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• azurerm_management_group_policy_assignment - Remove unnecessary length validation of resource name

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)

Fixes #18682

Note

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

[stephybun]

Thanks @marevers LGTM 👍

[github-actions]

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