docs: add Phase 4 migration examples and update guides

Dan Notesteinrequested to merge
docs/phase5-migration-guides into develop

Summary

Phase 5 documentation updates with real migration examples from completed Phase 4 work.

Changes

haf-app-testing-templates.md:

  • Added Quick Start section with variable aliases
  • Added DinD Test Templates (Phase 4) section
  • Added detailed migration examples from reputation_tracker and balance_tracker
  • Updated migrated applications table with MR links and line reduction stats
  • Added best practices section

haf-app-testing.md:

  • Added step-by-step migration guide (3 steps)
  • Added real before/after examples from reputation_tracker
  • Added guidance for apps with multiple DinD jobs
  • Added migration results table with line counts

Migration Stats

Project MR Before After Reduction
reputation_tracker !143 (closed) 168 lines 8 lines -160 lines
balance_tracker !261 445 lines 91 lines -354 lines

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