sql: fix stmtTraceThreshold for pausable portals #99404
Description
Since a pausable portal can be re-executed by re-calling connExecutor.ExecStmtInOpenState(), we should better record the trace threshold for all executions.
cockroach/pkg/sql/conn_executor_exec.go
Line 726 in d8ea15c
Specifically, now each re-execution will get a fresh budget and we won't include details about the previous executions, only about the last one.
Jira issue: CRDB-25867
Epic CRDB-25183