Auto: Version prefix is not being added in Pre-releases

Describe the bug

The prefix v is not being added when auto shipit (or auto next) is executed in a prerelease branch.
The option --no-version-prefix is ignored.

To Reproduce

1. Run auto shipit without --no-version-prefix in a branch listed in prereleaseBranches
2. The published Github Pre-Release doesn't contain the prefix v

Expected behavior

Add prefix v to prerelease branches when --no-version-prefix is false.

Screenshots

// .autorc.json
{
  "baseBranch": "master",
  "prereleaseBranches": ["develop"]
}

Note that the Release contains the prefix.

Environment information:

"auto" version: v9.54.3
"git"  version: v2.28.0
"node" version: v12.18.4

Additional context

I've noticed that the next command is not using the prefixRelease function as other commands do.
I can implement the parameter --no-version-prefix for the next command if that makes sense, or just use prefixRelease directly without the new parameter.