Remove old Web IDE terminal

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Description

In the old Web IDE we have a "Web Terminal" sidebar which points to some non-existent docs on how to set it up. We removed documentation for this feature in this MR !117778 (merged)

Screenshot_2024-07-21_at_10.03.09_PM

Can we remove this UI? Should we point to Workspaces docs instead?

Edited by 🤖 GitLab Bot 🤖