azurerm_synapse_workspace - Fix nilpointer for sql_aad_admin

[aristosvo]

Fixes #14272

• Acceptance Test for Synapse AAD Admin and Synapse SQL AAD Admin

[aristosvo]

It's not enough to fix just that reference

Edit: it was, twice the same object, naming was still a bit confusing though

[aristosvo]

 TF_ACC=1 go test -v ./internal/services/synapse -run=TestAccSynapseWorkspace_update -timeout 180m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccSynapseWorkspace_update
=== PAUSE TestAccSynapseWorkspace_update
=== CONT  TestAccSynapseWorkspace_update
--- PASS: TestAccSynapseWorkspace_update (962.88s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/synapse

[tombuildsstuff]

LGTM 👍

[tombuildsstuff]

Tests pass:

[github-actions]

This functionality has been released in v2.87.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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