Test: fixed width terminals

[meganrogge]

Refs: #74501

• macOS @jrieken
• linux @dynamicwebpaige
• Windows @stevencl

Complexity: 3

Authors: @Tyriar, @meganrogge

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Sometimes terminal line wrapping can be disruptive. In these cases, people want the option to switch it off or to set the terminal's dimensions for their particular use case. This iteration, we have added both to accommodate those requests.

Test:

• the workbench.action.terminal.setFixedDimensions command
• the workbench.action.terminal.toggleWrapping command
• the associated context menu actions in the tab and editor areas
• Alt + Z or Option + Z (mac) with the terminal focused should toggle wrapping