azurerm_mysql_flexible_server - support geo_backup_key_vault_key_id and geo_backup_user_assigned_identity_id

[neil-yechenwei]

fixes #20408

To enable geo_redundant_backup_enabled, these two properties geo_backup_key_vault_key_id and geo_backup_user_assigned_identity_id also need to be set.

[katbyte]

Test failures:

------- Stdout: -------
=== RUN   TestAccMySqlFlexibleServer_complete
=== PAUSE TestAccMySqlFlexibleServer_complete
=== CONT  TestAccMySqlFlexibleServer_complete
    testcase.go:110: Step 1/2 error: Error running apply: exit status 1
        
        Error: creating Flexible Server (Subscription: "*******"
        Resource Group Name: "acctestRG-mysql-230307035443686329"
        Flexible Server Name: "acctest-fs-230307035443686329"): polling after Create: Code="InternalServerError" Message="An unexpected error occured while processing the request. Tracking ID: '60d8c15a-3b56-48bd-9726-18b7f576fa67'"
        
          with azurerm_mysql_flexible_server.test,
          on terraform_plugin_test.tf line 63, in resource "azurerm_mysql_flexible_server" "test":
          63: resource "azurerm_mysql_flexible_server" "test" {
        
--- FAIL: TestAccMySqlFlexibleServer_complete (544.95s)
FAIL

[neil-yechenwei]

@katbyte , maybe it's quota issue, so I changed the test location for mysql in settings.kt in this PR. Hence, maybe you also have to change the test location before PR merge. I just now reran the test cases. Seems they all passed.

[katbyte]

@neil-yechenwei - if the wrong location is picked Code="InternalServerError" Message="An unexpected error occured while processing the request. is the error?

if that is so could you please open an issue on the rest specs detailing it, and adding a note in the documentation as that is a very hard to action/understand error

[neil-yechenwei]

@katbyte , raised an issue on azure rest api spec. Actually, the test case you above mentioned has failed with same error message for a long time in Teamcity. It's not related with this PR. I assume we don't need to add a note in the doc for now because I've talked with service team offline and they confirmed they would fix it asap.

[neil-yechenwei]

@katbyte , Seems the quota issue is resolved on your test subs. So I reverted the change about test location. I just now reran test cases and all passed.

[neil-yechenwei]

@katbyte , as test cases passed, is it fine to be merged for this PR?

[katbyte]

Thanks, LGTM aside from 1 comment

[github-actions]

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[github-actions]

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