Problem

The MongoDB Evergreen helper that runs from archive_dist_test activates archive_dist_test_debug only when the debug task is already present in the build. If the task is not materialized yet on a waterfall or cron version, the helper fails the archive task instead of scheduling the configured debug task.

This behavior contributed to BF-45621: https://jira.mongodb.org/browse/BF-45621.

Current behavior

• evergreen/activate_task.py activates an existing task with configure_task.
• For patches, a missing task is scheduled with configure_patch.
• For non-patch versions, a missing task causes a RuntimeError.
• The version API already provides activate_version_tasks, and the repository uses it for generated result tasks.

Requested change

• Add a non-patch fallback that activates/schedules the requested task through the Evergreen version task activation API.
• Preserve existing patch behavior, task-name overrides, commit-queue behavior, and explicit skip controls.
• Add unit coverage for the missing-task waterfall/version path and existing paths.

Acceptance criteria

• A configured archive_dist_test_debug task that is not yet present in a waterfall or cron build is scheduled through Evergreen without failing archive_dist_test.
• Existing tasks continue to be activated idempotently.
• Patch activation and explicit skip behavior remain unchanged.
• Unit tests cover the new API call and regression cases.