azurerm_mssql_server: Support for azuread_authentication_only

[aristosvo]

Fixes #12965
Fixes half of #12252, azurerm_sql_active_directory_administrator is out of scope of this PR as this also requires an update of the API version

Acceptance Test

❯ go install && make acctests SERVICE='mssql' TESTARGS='-run=TestAccMsSqlServer_azureadAdmin'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test -v ./internal/services/mssql -run=TestAccMsSqlServer_azureadAdmin -timeout 180m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccMsSqlServer_azureadAdmin
=== PAUSE TestAccMsSqlServer_azureadAdmin
=== CONT  TestAccMsSqlServer_azureadAdmin
--- PASS: TestAccMsSqlServer_azureadAdmin (1044.36s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/mssql        1046.330s

[katbyte]

Thanks @aristosvo - aside from one comment on the property name this looks good!

[aristosvo]

It would be easiest if #13753 was merged first, these PRs conflict with each other. I'll rebase it as soon it's merged.

[aristosvo]

@katbyte Rebase executed, specific test passing:

❯ go install && make acctests SERVICE='mssql' TESTARGS='-run=TestAccMsSqlServer_azureadAdmin'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test -v ./internal/services/mssql -run=TestAccMsSqlServer_azureadAdmin -timeout 180m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccMsSqlServer_azureadAdmin
=== PAUSE TestAccMsSqlServer_azureadAdmin
=== RUN   TestAccMsSqlServer_azureadAdminUpdate
=== PAUSE TestAccMsSqlServer_azureadAdminUpdate
=== CONT  TestAccMsSqlServer_azureadAdmin
=== CONT  TestAccMsSqlServer_azureadAdminUpdate
--- PASS: TestAccMsSqlServer_azureadAdmin (605.04s)
--- PASS: TestAccMsSqlServer_azureadAdminUpdate (968.51s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/mssql 970.095s

[github-actions]

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[github-actions]

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