brie: add default backup gc-ttl to 5m (#18750)
brie: add default backup gc-ttl to 5m (#18750)

Co-authored-by: ti-srebot <354121b1fcd840b60f1eb3b56f3ea5cc78ec06dd@users.noreply.github.com>
kyle-wang/tidb,pingcap/tidb,ngaut/tidb,coocood/tidb,pingcap/tidb,ngaut/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,coocood/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,XuHuaiyu/tidb,c4pt0r/tidb,XuHuaiyu/tidb,c4pt0r/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,kyle-wang/tidb,c4pt0r/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb