feat: enhance install_node_wrapped with error handling and extensive tests. fixes #336

- Added error handling to raise exceptions on download failures in install_node_wrapped.
- Introduced a comprehensive test suite for install_node_wrapped, covering successful installations, fallback mechanisms, and error scenarios.
- Ensured that no copy or build actions are performed after download failures, improving robustness.

Author: ekalinin

nodeenv.py

@@ -795,6 +795,7 @@ def install_node_wrapped(env_dir, src_dir, args):
                                   src_dir, args)
             else:
                 logger.warning('Failed to download from %s' % node_url)
+                raise
 
     logger.info('.', extra=dict(continued=True))