[otelgorm] gorm turns on prepared statement, and metrics cannot be used

[shuqingzai]

When PrepareStmt: true is set in gorm, the assertion fails, resulting in the inability to use metrics

See: Caches Prepared Statement

source: https://github.com/uptrace/opentelemetry-go-extra/blob/e41a0f223a916c275b50432d96bf88874c899faf/otelgorm/otelgorm.go#L58