CI: Fix test sync workflow

[sieniven]

Summary

• Fixes to the currently failing test-sync CI
• Refactor main.sh with shell scripting standards
• Refactor the sync pipeline with start_node_wait function that starts the defid node process and stores the PID.
• Refactor the sync pipeline with stop_node function that stops the defid node process, and tracks the state of the defid process to ensure node transits to exit.

Implications

• Storage

  • Database reindex required
  • Database reindex optional
  • Database reindex not required
  • None

• Consensus

  • Network upgrade required
  • Includes backward compatible changes
  • Includes consensus workarounds
  • Includes consensus refactors
  • None

[sieniven]

The PR fixes the CI workflow, but fails on diff log check with the reference logs stored on the gc.
Workflow run: https://github.com/DeFiCh/ain/actions/runs/5313674638