Removed caching on npm from Node install in copilot-reviewer, and fixed the double triggering issue on copilot-coder

Author: benleane83

.github/workflows/copilot-coder.yml

@@ -2,7 +2,7 @@ name: 🤖 GitHub Copilot Coder
 
 on:
   issues:
-    types: [opened, labeled]
+    types: [labeled]
 
 jobs:
   copilot-cli:

.github/workflows/copilot-reviewer.yml

@@ -41,7 +41,6 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '22.x'
-          cache: 'npm'
 
       - name: 🔍 Detect NPM Global Path
         run: |