[Internal] Fix custom app integration tests (#5129)

## Changes
<!-- Summary of your changes that are easy to understand -->
Have random name in the test

## Tests
<!--
How is this tested? Please see the checklist below and also describe any
other relevant tests
-->
Integration test

Author: tanmay-db

NEXT_CHANGELOG.md

@@ -15,3 +15,5 @@
 ### Exporter
 
 ### Internal Changes
+
+* Fix custom_app_integration_test ([#5129](https://github.com/databricks/terraform-provider-databricks/pull/5129))

apps/custom_app_integration_test.go

@@ -9,7 +9,7 @@ import (
 
 var (
 	customAppIntegrationTemplate = `resource "databricks_custom_app_integration" "this" {
-			name = "custom_integration_name"
+			name = "tf-{var.STICKY_RANDOM}-app-integration"
 			redirect_urls = ["https://example.com"]
 			scopes = ["all-apis"]
 			token_access_policy {