Cosmos node liveness

[mhagel]

Link to Issue

Closes: #5157

Description of Changes

• Creates a fallback strategy for failing Cosmos nodes
• Adds a health column to ChainNodes
• Renames cosmosLCD to cosmosAPI/v1

"How We Fixed It"

• If a chain node fails, we try the community proxy endpoint provided by cosmos.directory
• For a given period (default 5 minutes), we continue to use the proxy (using health flag and last_updated)

Test Plan

• Add playwright tests to demonstrate node-failure case (local only)
• Devnet tests will run in CI
• CA (click around) tested on local:
  • http://localhost:8080/ux/discussions/proposals -> Note loaded proposals
  • Set your local db to a failing node for /ux:

update "ChainNodes" set alt_wallet_url = 'willfail' where cosmos_chain_id = 'ux';
update "ChainNodes" set url = 'willalsofail' where cosmos_chain_id = 'ux';

• http://localhost:8080/ux/discussions/proposals again -> Expect proposals to still load

Deployment Plan

1. Optional env vars added for configuration. Not needed for deployment, although we may want to update the proxy referer when a whitelist header is agreed upon.
   COSMOS_PROXY_REFERER
FALLBACK_NODE_DURATION_S in seconds (defaults to 300 if not provided)

Other Considerations

• if Auto-upgrade Community to v1 if needed #6097 is merged first, we will want to make some adjustments to this PR.