chore: add tx metrics and logs for serialization errors (#15215)

Before db_metrics were all or nothing. Now `InTx` metrics are always recorded, and query metrics are opt in.


Adds instrumentation & logging around serialization failures in the database.

coderd/cryptokeys/rotate.go

@@ -161,8 +161,9 @@ func (k *rotator) rotateKeys(ctx context.Context) error {
 				}
 			}
 			return nil
-		}, &sql.TxOptions{
-			Isolation: sql.LevelRepeatableRead,
+		}, &database.TxOptions{
+			Isolation:    sql.LevelRepeatableRead,
+			TxIdentifier: "rotate_keys",
 		})
 }