fix: fix internal package name regex and field and remove package groups (#38)

Dropping the "matchManagers" as we actually want to match anything, regardless of manager.
Also fixing the regex, wasn't valid before.
Also renaming the "matchPackagePatterns" to "matchPackageNames" as the previous value isn't supported anymore..

Since it's JSON, renovate needs the regex to be quoted. See example:

```json
{
  "packageRules": [
    {
      "matchDatasources": ["npm"],
      "matchPackageNames": ["/^angular/"],
      "groupName": "Angular"
    }
  ]
}
```

Reviewed-on: #38
Reviewed-by: branch-buddy <branch-buddy@t00n.de>
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

common.json

@@ -12,8 +12,7 @@
     },
     {
       "description": "Exempt local dependencies from the minimum release age",
-      "matchManagers": ["docker-compose", "helm-values", "github-actions", "kubernetes", "dockerfile"],
+      "matchPackageNames": ["/^(https:\\/\\/)?gitea\\.t000-n\\.de/"],
-      "matchPackagePatterns": ["^(https:\\/\\/)?gitea\\.t000-n\\.de\/"],
       "minimumReleaseAge": null
     }
   ]