Use Alchemy's observability.redactQueryString and drop the post-deploy redact step (#605) #2578

Alchemy beta.84 (#2574) accepts observability.redactQueryString, which fired the #605 tripwire. Emit redactQueryString: true in packages/cli/src/gen/alchemy.ts, delete packages/cli/src/redact.ts and its use in index.ts, and check on one live deploy that query strings are redacted. Part of #605.