feat(cn-1475): add dragonfly flow orchestrator with fail-closed upload semantics

[kateeselius]

• Tests written and linted ℹ︎
• Documentation written ℹ︎
• Commit history is tidy ℹ︎

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[kateeselius]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• feat(cn-1476): register container test workflow with feature-flag gate to dragonfly path #56
• feat(cn-1475): add dragonfly flow orchestrator with fail-closed upload semantics #55 👈 (View in Graphite)
• feat(cn-1474): add file upload and test api client setup helpers #54
• feat(cn-1474): add legacy CLI scan-result acquisition with pluginVersion fact extraction #53
• feat(cn-1474): add container UploadResource builder #52
• feat(cn-1473): Transform entry, docker section, applications, and base remediation #51
• feat(cn-1473): severity filter, binary separation, regroup, finding conversion #50
• feat(cn-1473): add container test result Go types for findings transform #49
• feat(cn-1472): upgrade GAF and add container test configuration builder #48
• feat(cn-1471): scan-result envelope writer and dragonfly error types #47
• main

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