[Bug Fix] - azuredevops_serviceendpoint_azurerm - Fix azrerrm deleted but still returns to exist

[xuzhang3]

All Submissions:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• I ran lint checks locally prior to submission.
• Have you checked to ensure there aren't other open PRs for the same update/change?

What about the current behavior has changed?

The PR will fix the crash issue. Another issue found during the investigation is the VMSS used by current Agent Pool will occupied by it even the service connection has been deleted. This is a service bug.

Issue Number: #918

=== RUN   TestAccServiceEndpointAzureRm_CreateAndUpdate
=== PAUSE TestAccServiceEndpointAzureRm_CreateAndUpdate
=== RUN   TestAccServiceEndpointAzureRm_MgmtGrpCreateAndUpdate
=== PAUSE TestAccServiceEndpointAzureRm_MgmtGrpCreateAndUpdate
=== RUN   TestAccServiceEndpointAzureRm_AutomaticCreateAndUpdate
=== PAUSE TestAccServiceEndpointAzureRm_AutomaticCreateAndUpdate
=== RUN   TestAccServiceEndpointAzureRm_WorkloadFederation_Manual_CreateAndUpdate
=== PAUSE TestAccServiceEndpointAzureRm_WorkloadFederation_Manual_CreateAndUpdate
=== RUN   TestAccServiceEndpointAzureRm_WorkloadFederation_Automatic_CreateAndUpdate
=== PAUSE TestAccServiceEndpointAzureRm_WorkloadFederation_Automatic_CreateAndUpdate
=== RUN   TestAccServiceEndpointAzureRm_ManagedServiceIdentity_CreateAndUpdate
=== PAUSE TestAccServiceEndpointAzureRm_ManagedServiceIdentity_CreateAndUpdate
=== CONT  TestAccServiceEndpointAzureRm_CreateAndUpdate
=== CONT  TestAccServiceEndpointAzureRm_WorkloadFederation_Manual_CreateAndUpdate
=== CONT  TestAccServiceEndpointAzureRm_ManagedServiceIdentity_CreateAndUpdate
=== CONT  TestAccServiceEndpointAzureRm_WorkloadFederation_Automatic_CreateAndUpdate
=== CONT  TestAccServiceEndpointAzureRm_AutomaticCreateAndUpdate
=== CONT  TestAccServiceEndpointAzureRm_MgmtGrpCreateAndUpdate
--- PASS: TestAccServiceEndpointAzureRm_MgmtGrpCreateAndUpdate (94.54s)
--- PASS: TestAccServiceEndpointAzureRm_AutomaticCreateAndUpdate (121.61s)
--- PASS: TestAccServiceEndpointAzureRm_CreateAndUpdate (145.73s)
--- PASS: TestAccServiceEndpointAzureRm_WorkloadFederation_Manual_CreateAndUpdate (146.90s)
--- PASS: TestAccServiceEndpointAzureRm_ManagedServiceIdentity_CreateAndUpdate (146.98s)
--- PASS: TestAccServiceEndpointAzureRm_WorkloadFederation_Automatic_CreateAndUpdate (180.53s)
PASS
ok      github.com/microsoft/terraform-provider-azuredevops/azuredevops/internal/acceptancetests        184.712s

Does this introduce a change to go.mod, go.sum or vendor/?

• Yes
• No

Does this introduce a breaking change?

• Yes
• No

Any relevant logs, error output, etc?

(If it’s long, please paste to https://ghostbin.com/ and insert the link here.)

Other information