fix: should find all cycles info when cycle exists

[await-ovo]

fix pnpm/pnpm#5059

Given a graph like following:

   graphSequencer({
      graph: new Map([
        ['a', ['c']],
        ['b', ['c']],
        ['c', ['b']],
      ]),
      groups: [
        ['a', 'b', 'c'],
      ],
    })

It will output { safe: false, chunks: [ [ 'a' ], [ 'b' ], [ 'c' ] ], cycles: [] } currently, you can see that the cycle array is empty, it should have been cycle: [['c', 'b']]