‌‌‌‌‌‌azurerm_mysql_flexible_server_configuration: support setting gtid_mode as specified

[wuxu92]

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Description

Background: https://learn.microsoft.com/en-us/azure/mysql/flexible-server/concepts-read-replicas#global-transaction-identifier-gtid

After GTID is enabled, you can't turn it back off. If you need to turn GTID OFF, please contact support.
You can change GTIDs from one value to another only one step at a time in ascending order of modes. For example, if gtid_mode is currently set to OFF_PERMISSIVE, it's possible to change to ON_PERMISSIVE but not to ON.

This PR adds the logic to set the gtid_mode configuration step by step to achieve the goal.

PR Checklist

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Changes to existing Resource / Data Source

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Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

--- PASS: TestAccMySQLFlexibleServerConfiguration_GTIDMode (769.98s)
PASS

Change Log

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

• azurerm_mysql_flexible_server_configuration - support for setting gtid_mode [Support for mysql_flexible_server_configuration gtid_mode update directly to desired state #28482]

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 #28482

Note

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