Allows empty value and sets default value for maxRetries of cloud run job

.changelog/7425.txt

@@ -0,0 +1,6 @@
+```release-note:breaking-change
+cloudrunv2: set a default value of 3 for `max_retries` in `google_cloud_run_v2_job`. This should match the API's existing default, but may show a diff at plan time
+```
+```release-note:bug
+cloudrunv2: fixed the bug where setting `max_retries` to 0 in `google_cloud_run_v2_job` was not respected.
+```

google/resource_cloud_run_v2_job.go

@@ -400,9 +400,9 @@ This field is not supported in Cloud Run Job currently.`,
 									},
 									"max_retries": {
 										Type:        schema.TypeInt,
-										Computed:    true,
 										Optional:    true,
 										Description: `Number of retries allowed per Task, before marking this Task failed.`,
+										Default:     3,
 									},
 									"service_account": {
 										Type:        schema.TypeString,
@@ -2278,7 +2278,7 @@ func expandCloudRunV2JobTemplateTemplate(v interface{}, d TerraformResourceData,
 	transformedMaxRetries, err := expandCloudRunV2JobTemplateTemplateMaxRetries(original["max_retries"], d, config)
 	if err != nil {
 		return nil, err
-	} else if val := reflect.ValueOf(transformedMaxRetries); val.IsValid() && !isEmptyValue(val) {
+	} else {
 		transformed["maxRetries"] = transformedMaxRetries
 	}
 

google/resource_cloud_run_v2_job_test.go

@@ -157,7 +157,7 @@ resource "google_cloud_run_v2_job" "default" {
         connector = google_vpc_access_connector.connector.id
         egress = "ALL_TRAFFIC"
       }
-      max_retries = 2
+      max_retries = 0
     }
   }