ci: rename "jscpd" job to "lint-duplicate-code" aws#6443

## Problem
The "jscpd" CI check is often unnoticed by contributors, possibly
because its purpose is not clear.

## Solution
Rename it.

Author: justinmk3

.github/workflows/node.js.yml

@@ -57,7 +57,7 @@ jobs:
             - run: npm run testCompile
             - run: npm run lint
 
-    jscpd:
+    lint-duplicate-code:
         needs: lint-commits
         if: ${{ github.event_name == 'pull_request'}}
         runs-on: ubuntu-latest