Remove empty PATH entry on Windows

With the Windows 10 release, Microsoft added an interactive editor for the PATH variable e.g. [the workflow described here](https://learn.microsoft.com/en-us/dotnet/core/install/windows?tabs=net80#no-net-sdk-was-found). This normalizes the PATH entry by appending a `;` at the end of all entries. Here, because we split on the `;`, we'll end up with an empty entry. Later in the activation code, the paths are normalized with `os.path.normpath` which will expand this to `.` which can affect downstream code and can cause users concern since `.` has a special meaning on POSIX based systems.

conda/activate.py

@@ -611,6 +611,9 @@ def _get_starting_path_list(self):
             "PATH",
             clean_paths[sys.platform] if sys.platform in clean_paths else "/usr/bin",
         )
+        if sys.platform == "win32":
+            # Windows 10+ has a trailing semicolon by default, remove it to prevent empty entry
+            path = path.strip(os.pathsep)
         path_split = path.split(os.pathsep)
         return path_split