Remove data of the independent ckb-indexer

[Keith-CY]

CKB indexer of CKB node has been used since [email protected](https://github.com/nervosnetwork/neuron/releases/tag/v0.106.0) and the data of indexer are stored in a new directory(inside ckb directory).

However, data of the deprecated independent ckb indexer have not been removed and they cannot be cleared by clear cache.

To remove the outdated data, Neuron should add a task to check and remove them.

[yanguoyu]

Should we add choose for users to delete, or delete indexer data by default? @Keith-CY

[Keith-CY]

Should we add choose for users to delete, or delete indexer data by default? @Keith-CY

I think it's safe to delete them because [email protected] doesn't have an independent ckb indexer, so the data will not be used by any service. If the user runs ckb indexer by own, the indexer data will be stored elsewhere.

Namely, the indexer data is only accessible to the independent ckb indexer inside Neuron.

[yanguoyu]

nervosnetwork/neuron#2565

[Keith-CY]

Sorry for adding a new detail, a precondition is expected to be added that the removal of old data should only be executed after the migration is fulfilled(the new path was set).

[yanguoyu]

Sorry for adding a new detail, a precondition is expected to be added that the removal of old data should only be executed after the migration is fulfilled(the new path was set).

Add this with nervosnetwork/neuron@2c876c0