[Internal] Mark TestAccServicePrincipalResourceOnAzure test as flaky (#4333)

## Changes
Mark TestAccServicePrincipalResourceOnAzure test as flaky

## Tests
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- [ ] `make test` run locally
- [ ] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] using Go SDK
- [ ] using TF Plugin Framework

Author: hectorcast-db

test-config.yaml

@@ -17,4 +17,7 @@ ignored_tests:
       comment: Failures due to read-after-write inconsistency. Tracked in https://databricks.atlassian.net/browse/ES-1100061
     - package: github.com/databricks/terraform-provider-databricks/internal/acceptance
       test_name: TestUcAccVectorSearchEndpoint
-      comment: Failure due to read-after-create inconsistency. https://databricks.atlassian.net/browse/ES-1243690
+      comment: Failure due to read-after-create inconsistency. https://databricks.atlassian.net/browse/ES-1243690
+    - package: github.com/databricks/terraform-provider-databricks/internal/acceptance
+      test_name: TestAccServicePrincipalResourceOnAzure
+      comment: Failure due to read-after-write inconsistency. Tracked in https://databricks.atlassian.net/browse/ES-1100061