[Fix] handle auto-enabled errors withdatabricks_system_schema

[nkvuong]

Changes

• Handle new error message billing system schema can only be enabled by Databricks. Resolves [ISSUE] Failures for Auto-Enabled System Tables #4539
• Update documentation with warnings about auto-enabled system schemas.
• Enable system schema integration test on GCP

Tests

• make test run locally
• relevant change in docs/ folder
• covered with integration tests in internal/acceptance
• using Go SDK
• using TF Plugin Framework

[alexott]

@nkvuong how it will handle destroy? Will it fail trying to disable the schema?

[nkvuong]

@nkvuong how it will handle destroy? Will it fail trying to disable the schema?

@alexott our API actually succeeds 😕

[alexott]

@nkvuong maybe we can add a computed flag that specifies that it's auto-enabled? And then in the Delete skip the deletion?

[github-actions]

If integration tests don't run automatically, an authorized user can run them manually by following the instructions below:

Trigger:
go/deco-tests-run/terraform

Inputs:

• PR number: 4547
• Commit SHA: d127b8c8183eb483a892627d006355706e9e66be

Checks will be approved automatically on success.