fix: avoid missed logs when streaming startup logs (#8029)

* feat(coderd,agent): send startup log eof at the end

* fix(coderd): fix edge case in startup log pubsub

* fix(coderd): ensure startup logs are closed on lifecycle state change (fallback)

* fix(codersdk): fix startup log channel shared memory bug

* fix(site): remove the EOF log line

coderd/database/sqlc.yaml

@@ -55,6 +55,7 @@ overrides:
       uuid: UUID
       failure_ttl: FailureTTL
       inactivity_ttl: InactivityTTL
+      eof: EOF
 
 sql:
   - schema: "./dump.sql"