Fix cache warmer: add Windows runner, timestamp keys, enable long paths

1. Add Windows runner to warmer matrix (OS-scoped cache).
2. Timestamp-based cache keys (no manual deletion needed).
3. Run exact CI commands to cache all plugins.
4. Enable long paths on Windows before checkout (repo has files
   exceeding 260-char Windows path limit).

Signed-off-by: Gopal Lal <gopal.lal@databricks.com>
Co-authored-by: Isaac
Signed-off-by: Gopal Lal <gopal.lal@databricks.com>

Author: gopalldb

.github/workflows/warmMavenCache.yml

@@ -46,6 +46,10 @@ jobs:
           java-version: 21
           distribution: 'adopt'
 
+      - name: Enable long paths (Windows)
+        if: runner.os == 'Windows'
+        run: git config --system core.longpaths true
+
       # If PR number provided, checkout only pom.xml files from the fork (security: no source code)
       - name: Checkout PR pom.xml files (sparse)
         if: inputs.pr_number != ''