feat(template-mcps): Add configuration for datahub-gc

[david-leifker]

• Runs garbage collection functions on a schedule

Changes to generate configuration which allows overriding when and which options should be used for datahub-gc job.

            - name: DATAHUB_GC_BOOTSTRAP_VALUES
              value: "{\"cleanup_expired_tokens\":false,\"dataprocess_cleanup\":{\"delete_empty_data_flows\":true,\"delete_empty_data_jobs\":true,\"hard_delete_entities\":false,\"keep_last_n\":10,\"retention_days\":30},\"ingestion\":{\"name\":\"datahub-gc\"},\"schedule\":{\"interval\":\"15 23 * * *\",\"timezone\":\"America/Chicago\"},\"soft_deleted_entities_cleanup\":{\"retention_days\":30},\"truncate_indices\":true}

especially overriding schedule for running at a random start time for a given timezone

\"schedule\":{\"interval\":\"15 23 * * *\",\"timezone\":\"America/Chicago\"}

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable)

[david-leifker]

This configuration is stable and should be switched to the default.