fix(datacatalog): add delay in quickstart test to avoid test flakes. (#2201)
fix(datacatalog): add delay in quickstart test to avoid test flakes. (#2201)

Fixes: https://github.com/GoogleCloudPlatform/golang-samples/issues/2200
GoogleCloudPlatform/golang-samples,GoogleCloudPlatform/golang-samples,GoogleCloudPlatform/golang-samples