gc_worker: fix bug of saving gc safe point to pd before do distributed gc (#10927)
gc_worker: fix bug of saving gc safe point to pd before do distributed gc (#10927)


qiuyesuifeng/tidb,cosmtrek/tidb,XuHuaiyu/tidb,ngaut/tidb,c4pt0r/tidb,ngaut/tidb,ming-relax/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,qiuyesuifeng/tidb,pingcap/tidb,kyle-wang/tidb,Cofyc/tidb,kyle-wang/tidb,kyle-wang/tidb,pingcap/tidb,coocood/tidb,cosmtrek/tidb,kyle-wang/tidb,XuHuaiyu/tidb,ming-relax/tidb,EvilMcJerkface/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb,coocood/tidb,Cofyc/tidb,EvilMcJerkface/tidb