Switch to the canary environment with a keyboard shortcut

Release notes

Switch to the canary environment with a keyboard shortcut

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Problem to solve

Switching to Canary environment with a keyboard shortcut is very much easier than opening a new tab to switch to Canry

Intended users

All users in GitLab.com

Proposal

Introduce a keyboard shortcut that this toggles between https://next.gitlab.com/ and https://gitlab.com/