Make checkREnvironment.sh truly conditional

- Use conditional filename: {% if r_data_science %}checkREnvironment.sh{% endif %}.jinja
- File is only generated when r_data_science is selected
- No empty files created for non-R projects

Author: jpvelez

….devcontainer/checkREnvironment.sh.jinja … %}checkREnvironment.sh{% endif %}.jinjatemplate/.devcontainer/checkREnvironment.sh.jinja renamed to template/.devcontainer/{% if r_data_science %}checkREnvironment.sh{% endif %}.jinja template/.devcontainer/checkREnvironment.sh.jinja renamed to template/.devcontainer/{% if r_data_science %}checkREnvironment.sh{% endif %}.jinja

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