chore - update resource azurerm_machine_learning_workspace to use auto-generated parsers and validators

[gro1m]

This PR makes updates the current azurerm_machine_learning_workspace resource with using the capability to auto-generate the parsers and validators.
This could have the maybe unwanted side-effect of dropping parsing of azure container registry and azure storage account validations. To be assessed by the reviewer and maybe small changes could improve this still a bit:)

Test should still pass:

TF_ACC=1 go test -v ./azurerm/internal/services/machinelearning -run=TestAccMachineLearningWorkspace -timeout 60m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
2021/05/16 16:15:25 [DEBUG] not using binary driver name, it's no longer needed
2021/05/16 16:15:25 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccMachineLearningWorkspaceDataSource_basic
=== PAUSE TestAccMachineLearningWorkspaceDataSource_basic
=== RUN   TestAccMachineLearningWorkspace_basic
=== PAUSE TestAccMachineLearningWorkspace_basic
=== RUN   TestAccMachineLearningWorkspace_requiresImport
=== PAUSE TestAccMachineLearningWorkspace_requiresImport
=== RUN   TestAccMachineLearningWorkspace_basicUpdate
=== PAUSE TestAccMachineLearningWorkspace_basicUpdate
=== RUN   TestAccMachineLearningWorkspace_complete
=== PAUSE TestAccMachineLearningWorkspace_complete
=== RUN   TestAccMachineLearningWorkspace_completeUpdate
=== PAUSE TestAccMachineLearningWorkspace_completeUpdate
=== CONT  TestAccMachineLearningWorkspaceDataSource_basic
=== CONT  TestAccMachineLearningWorkspace_requiresImport
=== CONT  TestAccMachineLearningWorkspace_completeUpdate
=== CONT  TestAccMachineLearningWorkspace_complete
=== CONT  TestAccMachineLearningWorkspace_basic
=== CONT  TestAccMachineLearningWorkspace_basicUpdate
2021/05/16 16:15:31 [DEBUG] Determining which Resource Providers require Registration
2021/05/16 16:15:31 [DEBUG] All required Resource Providers are registered
2021/05/16 16:15:31 [DEBUG] TF_ACCTEST_REATTACH set to 1 and acctest.TestHelper is not nil, using reattach-based testing
2021/05/16 16:19:00 [DEBUG] TF_ACCTEST_REATTACH set to 1 and acctest.TestHelper is not nil, using reattach-based testing
2021/05/16 16:19:12 [DEBUG] TF_ACCTEST_REATTACH set to 1 and acctest.TestHelper is not nil, using reattach-based testing
--- PASS: TestAccMachineLearningWorkspaceDataSource_basic (358.17s)
--- PASS: TestAccMachineLearningWorkspace_basic (359.21s)
--- PASS: TestAccMachineLearningWorkspace_complete (364.12s)
--- PASS: TestAccMachineLearningWorkspace_requiresImport (369.95s)
--- PASS: TestAccMachineLearningWorkspace_basicUpdate (397.91s)
--- PASS: TestAccMachineLearningWorkspace_completeUpdate (401.94s)
PASS
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/machinelearning     406.857s

[gro1m]

Closed in favor of #11739 (the same just without cluttering commits)

[github-actions]

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