Parallel Inclusion of `ensv2` and `subgraph` plugins in Railway ENSIndexers

[shrugs]

• Blue: update the shared env variables for the alpha deployments to include ensv2
• Green: update the shared env variables for the alpha deployments to include ensv2
• Green: update the instance env var mapping to use the new ENSINDEXER_SCHEMA_NAME and ENSDB_URL params
• update the shared env variables from *_DATABASE_SCHEMA to *_ENSINDEXER_SCHEMA_NAME

[coderabbitai]

🔗 Related PRs

#1587 - feat(ci): include ENSNode v2 Sepolia instance in workflows config [merged]
#1611 - Infrastructure updates for Yellow env [merged]
#1618 - infra(yellow-env): upsize volume attached to ENSDb [merged]
#1730 - Remove Core Plugin Restriction [merged]

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