Pin Renovate Maven lookups to the registry hosting each package

Renovate's Maven manager appends Maven Central to every Maven dependency
regardless of settings.xml, and the datasource queries every registry for
every dep. When Central answers 429, the datasource raises an
ExternalHostError and the whole run aborts before any lookup or update.
This is what has been aborting runs in packtests since around Sep 6, and
this repo is exposed to the same failure even though its settings.xml only
declares GitHub Packages.

- Restrict org.cyclops.* lookups to our GitHub Packages registry, so
  Central is no longer in the lookup path at all.
- Add a hostRule for repo.maven.apache.org as a backstop. Its description
  records that it does not actually suppress the Central abort, since the
  Maven datasource throws unconditionally for that host.
- Migrate matchPackagePrefixes to matchPackageNames in "Cyclops packages",
  which Renovate was reporting as a needed config migration.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N6hkW22Va1tk2EqxDguWG4

Author: rubensworks

renovate.json

@@ -8,6 +8,12 @@
     {
       "matchHost": "https://maven.pkg.github.com/CyclopsMC/packages",
       "token": "{{ secrets.RENOVATE_GITHUB_COM_TOKEN }}"
+    },
+    {
+      "description": "Backstop only. The registryUrls rule below is what actually keeps Central out of the lookup path, since the Maven datasource raises an ExternalHostError on a Central 429 regardless of these flags.",
+      "matchHost": "repo.maven.apache.org",
+      "abortOnError": false,
+      "abortIgnoreStatusCodes": [429]
     }
   ],
   "packageRules": [
@@ -22,9 +28,15 @@
       "automergeType": "branch",
       "versioning": "regex:^(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+)(-(?<build>\\d+))?$"
     },
+    {
+      "description": "Cyclops mods are only published to our GitHub Packages registry",
+      "matchManagers": ["maven"],
+      "matchPackageNames": ["org.cyclops.{/,}**"],
+      "registryUrls": ["https://maven.pkg.github.com/CyclopsMC/packages"]
+    },
     {
       "matchManagers": ["maven"],
-      "matchPackagePrefixes": ["org.cyclops."],
+      "matchPackageNames": ["org.cyclops.{/,}**"],
       "groupName": "Cyclops packages"
     }
   ],