sysvar: re-organize the order of sysvars by their scopes. (#33149)
sysvar: re-organize the order of sysvars by their scopes. (#33149)

close pingcap/tidb#33086
ngaut/tidb,c4pt0r/tidb,kyle-wang/tidb,ngaut/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,c4pt0r/tidb,c4pt0r/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,kyle-wang/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb