Bug Fix - azurerm_virtual_desktop_workspace_application_group_association- Association should not remove the tags

[xuzhang3]

Fixes: #18677
Association update should not remove the workspace tags.

[stephybun]

The tests didn't pick this up, so can we update a test to set the tags?

[xuzhang3]

@stephybun test cases updated.
AccTests:

=== RUN   TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_basic
=== PAUSE TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_basic
=== RUN   TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_complete
=== PAUSE TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_complete
=== RUN   TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_update
=== PAUSE TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_update
=== RUN   TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_requiresImport
=== PAUSE TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_requiresImport
=== CONT  TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_basic
=== CONT  TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_requiresImport
=== CONT  TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_update
=== CONT  TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_complete
--- PASS: TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_basic (273.43s)
--- PASS: TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_complete (283.12s)
--- PASS: TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_requiresImport (313.96s)
--- PASS: TestAccVirtualDesktopWorkspaceApplicationGroupAssociation_update (512.66s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/desktopvirtualization 568.500s

[stephybun]

Thanks @xuzhang3 LGTM 👍

[github-actions]

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[github-actions]

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