bigtable/beam test(s) are failing

#### Description

After the dependency upgrades in #9234 one or more tests under [bigtable/beam/workload-generator][1] fail in Java 11 ([sponge][s11]) and Java 17 ([sponge][s17]).

Based on the errors it looks like the failing test is `bigtable.WorkloadGeneratorTest.testDeployedPipeline` and it fails because the missing object `gs://cloud-bigtable-dataflow-templates/generate-workload.json`

Remove `Ignore` attribute from the tests after fixing the issue.

[1]: https://github.com/renovate-bot/java-docs-samples/tree/7e0e1e86a234f0eb6ef6cbdff76f549606cf4582/bigtable/beam/workload-generator
[s11]: https://source.cloud.google.com/results/invocations/414ebc9d-1bde-4c38-b7ec-93d25dc2b3b1
[s17]: https://source.cloud.google.com/results/invocations/3cf4f262-5fa1-41c8-9e1a-65a14e28433f