global tables cause changefeeds to stop with an error

[aliher1911]

Describe the problem

When using global tables, changefeed jobs could stop with error like:

job failed (job 808401699232022529: failed to update record 1ec4a4bb-c5fe-433f-8e9f-98c605929a75: protectedts-update: could not parse "1666775632584715007.0000000000?" as type decimal)

as reported by client.

This is caused by using hlc.Timestamp.AsOfSystemTime() when inserting values in protected timestamps internal table.

cockroach/pkg/kv/kvserver/protectedts/ptstorage/storage.go

Lines 78 to 80 in 99d1530

	row, err := p.ex.QueryRowEx(ctx, "protectedts-update", txn,
	sessiondata.InternalExecutorOverride{User: security.NodeUserName()},
	updateTimestampQuery, id.GetBytesMut(), timestamp.AsOfSystemTime())

Schema expects decimal value and can't accept synthetic syntax with trailing '?' which was added in 21.1.

Reported against
CockroachDB Version: v22.1.9

But all versions should be affected.

Jira issue: CRDB-21489