Update tanuki to match branding
Issue description
Update the tanuki logo, cover art, and loading state screen
Figma: https://www.figma.com/file/ejyySgLSCEUdpEhGay5T5I/Gitlab-Figma-Plugin?node-id=99%3A1341
File locations:
- figma_plugin_directory_assets/plugin-coverart.png
- figma_plugin_directory_assets/plugin-icon.png
- src/ui/assets/icons/gitlab-icon-rgb.svg
Edited by Michael Le