Changes

feat(scripts/pingcap/community): refactor community member syncing (#3508)

Why: we need control the approval for files in root folder of the
project, so we need filter mode OWNERS files to work correct with
community memberships.

Changes:
- Add CLI option: `--filterMode`, default is `false`.

Effects:
- simple prow owners mode: https://github.com/pingcap/tidb/pull/60977
- filter prow owners mode: https://github.com/pingcap/tidb/pull/60976
 (commit: c45ba4f)