Wrap checkREnvironment.sh in r_data_science conditional

- Only generate the script when r_data_science is selected
- Keeps projects clean by not including unnecessary R files

Author: jpvelez

template/.devcontainer/checkREnvironment.sh.jinja

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+{% if r_data_science %}#!/usr/bin/env bash
 set -euo pipefail
 
 # R Environment Check Script
@@ -51,3 +51,4 @@ else
 fi
 
 echo "🎉 R environment check completed successfully"
+{% endif %}