BED-6662: Migration to toggle Feature Flag 'open_graph_phase_2'

[specter-flq]

Description

Added migration to toggle open_graph_phase_2 feature flag to enable UI features behind it

Motivation and Context

Resolves: BED-6662

How Has This Been Tested?

Manually tore down the DB and rebuilt to test if the flag was enabled

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
  • Associated an issue: Issues and Pull Requests README #672
  • Read the Contributing guide: https://github.com/SpecterOps/BloodHound/wiki/Contributing
• I have ensured that related documentation is up-to-date
  • Open API docs
  • Code comments (GoDocs / JSDocs)
• I have followed proper test practices
  • Added/updated tests to cover my changes
  • All new and existing tests passed

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch BED-6661--migration-open-graph-2

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