Support admin-only option for redirecting presets

[rarkins]

What would you like Renovate to be able to do?

As a bot admin, I'd like the ability to "change" a deprecated preset to another without manually changing every repository. e.g. from npm-based preset to platform-based.

Did you already have any implementation ideas?

A new config object, e.g. presetMigrations, like so:

modules.exports =
{
  presetMigrations: {
    foo: 'github>myorg/foo',
    '@bar': 'github>bar/renovate-config'
  }
}

When this exists, I think two separate things need doing:

• If the preset is directly extended in this repo, we should migrate it in the config so that it will (one day) be migrated using a PR
• If the preset is nested, invisibly change/fix it

[renovate-release]

🎉 This issue has been resolved in version 25.29.0 🎉

The release is available on:

• GitHub release
• 25.29.0

Your semantic-release bot 📦🚀