Button to refresh select environment

@eleanorjboyd đang làm issue này rồi.

Từ ngày 23/7/2025.

During "select interpreter" there used to be a button for refreshing the list on the python extension that is not on the python environments extension. (i.e., the circular arrow in the top right corner from the second picture). User requested the feature returned: [here](https://github.com/microsoft/vscode-python-environments/issues/590#issuecomment-3106135736)