Graph Horizon: upgrade guides

Phase 3 (Nov 13th/14th)

• Deploy temporary network subgraph (Juan + Miguel)

Phase 3 upgrade window (Nov 14th - Dec 9th)

• Upgrade upgrade indexers to horizon stack versions (SREs? + Tomas)
• Deploy Phase 3 gateway with dual dispute manager support (Theo + Tomas)

Phase 4 (Dec 9th)

• Upgrade “official” network subgraph to horizon version (Juan + Miguel)
• Deploy gateway components horizon version (Theo + Tomas)
  • gateway, tap-aggregator, tap-escrow-manager
• Deploy Graph Explorer horizon version (Daniel + Miguel)
• Point upgrade indexer to “official” network subgraph (SREs? + Tomas)