v3.15.0

New additions

• Added --if-exists option to snow object drop command and object-specific drop commands (e.g., snow stage drop) to drop objects only if they exist, preventing errors when dropping non-existent objects.

Fixes and improvements

• Fix git repository path parsing to allow quotes around both repo and branch names (e.g., @"example-repo"/branches/"feature/branch"/*).
• Fix externalbrowser auth for headless systems.
• Update project definition with supported python versions aligned with snowflake-connector-python