put the error changefeed into failed state and calculate the ticdc global
gc safepoint based on checkpoint ts of all changefeeds and give users 24
hours grace period to handle the failed changefeed.

e.g.,

Have two ChangeFeeds,
cf1(failed) with checkpointTs ts1
cf2(normal) with checkpointTs ts2

the global gc safepoint will be:
min(ts2, max(ts1, currentPDTs - 24 hours))

…lized