Support the disable-custom-source flag

## Enhancement

Support the `disable-custom-source` flag is used to close fetch tags from custom source with one click.

Usage:
```bash
$ kusionup ls-ver
github@v0.1.0
github@v0.2.0
custom@v0.1.0-internal
custom@v0.2.0-internal

$ kusionup ls-ver --disable-custom-source
github@v0.1.0
github@v0.2.0
```