Changes

This PR adds support for labels in the renovate.json config file for the Gerrit platform. In Gerrit, labels are done through hashtags.

Example:

{
  "packageRules": [
    {
      "matchPackageNames": ["dependency-name"],
      "labels": [
        "hi there",
        "hi+there",
        "hi-there",
        "hi_there",
        "hi/there",
        "hi%there",
        "hi=there",
        "hi.there",
        "hi;there",
        "hi^there",
        "hi~there",
        "hi@there",
        "hi$there",
        "hi#there"
      ]
    }
  ]
}

Therefore, this PR also adds support for rebaseLabel, stopUpdatingLabel, and keepUpdatedLabel for the Gerrit platform.

EDIT: the following is no longer part of this PR.

Furthermore, it changes the rebase instructions to prefer rebaseLabel instead. This is especially important in Gerrit because otherwise updating the commit message will cause the CI pipelines to be triggered.

Context

This is a missing feature in the Gerrit platform, and I thought it would be nice to have it.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository