batch on delete cause the resolved-ts spikes and tikv-cdc memory quota full

[3AceShowHand]

1. insert many rows into the upstream tidb cluster.
2. run the following sql

batch on test.bank0.id limit 20000 delete from test.bank0;

The resolved-ts increase a lot, and TiKV-CDC memory quota also increase, implies that the TiCDC cannot consume data in time.