UX: Open terminal by default when launching workspace

MR: Show terminal on start up (gitlab-web-ide-vscode-fork!112 - merged)

MR2: feat: Show Terminal on Start up (gitlab-org/workspaces/gitlab-workspaces-tools!27 - merged)

Description

Recommendation originating from UX Scorecard gitlab-design#2445 (closed)

Users who aren't familiar with VS Code have a hard time finding the terminal. Since the terminal is a key part of the a developer's workflow, opening it by default will likely be a net positive.

Acceptance Criteria

TODO: Fill out (required)

• User is able to visualize the terminal on startup.

Proposed solution

• Have the terminal open by default in VS Code once a workspace is available. Set terminal.integrated.showOnStartup to true