Changes

feat(scripts/flow/ga): add GA flow script for create patch release branches on some repos (#3241)

Create release branche `release-X.Y.Z` when released vX.Y.Z TiDB version
for these repos:

- `tidb-test`
- `enterprise-plugin`

Signed-off-by: wuhuizuo <wuhuizuo@126.com>

Signed-off-by: wuhuizuo <wuhuizuo@126.com>
 (commit: d7624f2)