Test: Extended powershell keybindings

[Tyriar]

Refs: #45705

• macOS @IanMatthewHuff
• linux @deepak1556
• windows @aiday-mar

Complexity: 2

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There's new keybindings that work in pwsh, to test:

• Install pwsh 7+ if it's not already
• Open a terminal, shell integration should automatically turn on (unless you changed the setting)
• Try the keybindings called out in https://github.com/microsoft/vscode-docs/blob/vnext/release-notes/v1_70.md#extended-powershell-keybindings
• Try rebind keys via Set-PSReadlineKeyHandler inside your pwsh profile (run code $Profile in the terminal)