[Feat] Checkout branch

Photo by Mila Tovar on Unsplash

Description

Web IDE users should be able to:

• View current branch
• Search through available branches
• Checkout branch
• Create new branch without committing

Current workaround

#72 (comment 1218668715)

If you will try to commit it will offer you to create a new branch, so you don't have to commit straight to master

VS Code native branch switcher

Availability and Testing

• @jzhang_gl will update the E2E spec to probably include switching branch and committing.
• Run package-and-qa to make sure existing new web-ide specs pass.