Handle rc container in _update_container_image_for_dataflow

[Abacn]

Please add a meaningful description for your change here

In Python SDK submitting to Dataflow job there is a logic overriding apache/beam_python3.X_sdk:<label> to gcr.io/cloud-dataflow/v1beta3/beam_python3.X_sdk:<label>:

beam/sdks/python/apache_beam/runners/dataflow/internal/apiclient.py

Line 736 in 21009e6

return names.DATAFLOW_CONTAINER_IMAGE_REPOSITORY + '/' + image_suffix

This generally works except the container has a release candidate tag. which were pushed to dockerhub, e.g. apache/beam_python3.11_sdk:2.58.0rc2 the corresponding gcr.io/cloud-dataflow/v1beta3/beam_python3.11_sdk:2.58.0rc2 does not exist, then Dataflow job fails indefinitely.

This does not happen for Python job alone, because the __version__ of the package does not contain "rcX" suffix (even though the pypi version name is rcX) and apiclient resolves to 2.XX.0. However, for JavaUsingPython xlang pipeline, this becomes a problem because the parsed in Python SDK version string is used to assemble the docker image, which contains "rc" suffix.

This affected release candidate validation, e.g. in GoogleCloudPlatform/DataflowTemplates#1761

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[jrmccluskey]

LGTM, thanks!