dataproc: add encryption_config as custom_schema_value for workflowTemplate

[BBBmau]

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

dataproc: add `encryption_config` block to `google_dataproc_workflow_template`

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 3 insertions(+), 2 deletions(-))