[Dataproc] Add instance_flexibility_policy with provisioning_model_mix to secondary_worker_config in google_dataproc_workflow_template

[realdev12]

Purpose

Add support for Dataproc Flexible VMs (instance_flexibility_policy) and provisioning_model_mix to secondary_worker_config in google_dataproc_workflow_template. This enables secondary/preemptible worker groups to combine multiple machine shapes with mixed Standard and Spot/Preemptible VM capacities.

Implementation Scope & Design Decisions

To maintain parity with the existing google_dataproc_cluster resource and keep this PR reviewable and well-scoped:

1. Provisioning Model Mix: provisioning_model_mix (standard_capacity_base, standard_capacity_percent_above_base) is supported exclusively on secondary_worker_config, adhering to Dataproc API requirements where provisioning model mixing applies only to secondary/preemptible workers.
2. PR Stacking: Stacked on PR 2 (dataproc-flex-vm-master). Base branch is set to dataproc-flex-vm-master.

Tests & Verification

• Generated code for both beta and ga providers.
• Verified compilation in both downstream providers with 0 errors.
• Extended acceptance test TestAccDataprocWorkflowTemplate_instanceFlexibilityPolicy exercising secondary_worker_config.instance_flexibility_policy along with provisioning_model_mix assertions.

dataproc: added `instance_flexibility_policy` and `provisioning_model_mix` to `secondary_worker_config` in `google_dataproc_workflow_template`

[github-actions]

Googlers: For automatic test runs see go/terraform-auto-test-runs.

@SirGitsalot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 9129add:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	6 files changed, 4769 insertions(+), 1583 deletions(-)
google-beta provider	View Diff	6 files changed, 4792 insertions(+), 1606 deletions(-)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
93	85	6	2

Affected Service Packages

• dataproc

Learn how VCR tests work

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Step 1: Replaying Mode

Action taken

Found 2 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccDataprocWorkflowTemplate_basic
• TestAccDataprocWorkflowTemplate_instanceFlexibilityPolicy

View the replaying VCR build log

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Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccDataprocWorkflowTemplate_basic
✅ Log	✅	TestAccDataprocWorkflowTemplate_instanceFlexibilityPolicy

🟢 All tests passed!

View the recording VCR build log or the debug logs folder for detailed results.

@realdev12, @SirGitsalot VCR tests complete for 9129add!

[github-actions]

@SirGitsalot This PR has been waiting for review for 3 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.