BED-4696 feat: add preMigrationDaemons support

[mistahj67]

Description

• Added a preMigrationDaemons property to initializer struct in order to allow daemons to start before migrations are run
• Moved the tools api daemon to the preMigrationDaemons property to launch the API prior to migrations
• Added a /health endpoint for infrastructure & container management

Motivation and Context

This PR addresses: BED-4696

Long running migrations on large datasets prevent the bh API /health endpoint from starting which can trip container management automation tied to the /health endpoint. This bh API /health endpoint remains unchanged and can be used in conjunction with the above to determine where in the bootstrap the process is.

How Has This Been Tested?

Force added a couple minutes sleep to the migration check
Hit GET 0.0.0.0:2112/health after launching before migration sleep finishes.

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