chore: remove schedule, move node package rule up [DX-665] (#1588)

## Summary

Tune the Renovate configuration by removing the scheduling constraint
and reordering the Node.js package rule for correct evaluation priority
(DX-665).

## Description

- Remove the `"schedule": ["before 5am"]` setting so Renovate PRs are no
longer restricted to a narrow UTC window and can be created at any time.
- Move the Node.js / `@types/node` pin rule higher in the `packageRules`
array, placing it immediately after the npm category enablement rule.
Renovate applies package rules in order, so positioning this rule before
the production and dev dependency grouping rules ensures the version pin
is evaluated first and not inadvertently overridden by later group
rules.

## Motivation and Context

## PR Checklist

- [x] I have read the `CONTRIBUTING.md` file
- [x] All commits follow [conventional
commits](https://www.conventionalcommits.org/en/v1.0.0/)
- [x] Documentation is updated (if necessary)
- [x] PR doesn't contain any sensitive information
- [x] There are no breaking changes

Author: michaelphamcf

renovate.json

@@ -6,7 +6,6 @@
     ":automergeAll"
   ],
   "timezone": "UTC",
-  "schedule": ["before 5am"],
   "prConcurrentLimit": 15,
   "semanticCommits": "enabled",
   "semanticCommitType": "build",
@@ -18,6 +17,12 @@
       "matchCategories": ["npm"],
       "enabled": true
     },
+    {
+      "description": "Pin Node.js and @types/node to 18.x",
+      "matchPackageNames": ["node", "@types/node"],
+      "allowedVersions": "^18",
+      "automerge": false
+    },
     {
       "description": "Group production dependencies, use deps scope",
       "matchDepTypes": ["dependencies"],
@@ -36,12 +41,6 @@
       "semanticCommitScope": "gha",
       "pinDigests": true,
       "groupName": "github-actions"
-    },
-    {
-      "description": "Pin Node.js and @types/node to 18.x",
-      "matchPackageNames": ["node", "@types/node"],
-      "allowedVersions": "^18",
-      "automerge": false
     }
   ]
 }