align whitespace menu option with setting (#306483)

* align render whitespace menu option (https://github.com/microsoft/vscode/issues/305883)

* Use descriptive titles and shortTitle for render whitespace mode commands

Agent-Logs-Url: https://github.com/microsoft/vscode/sessions/d7e269a5-e4e5-4d4c-967d-2b2c9f09b835

Co-authored-by: joshspicer <[email protected]>

* Move submenu registration into Action2 menu property, remove duplicate MenuRegistry calls

Agent-Logs-Url: https://github.com/microsoft/vscode/sessions/68d6d9ff-b7a9-41b1-89f7-3c561b677802

Co-authored-by: joshspicer <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>