[CmdPal] Replaced ellipsis button with 'More' label + shortcut textblock

[brianjames-dev]

This PR improves the command bar UI in the command palette.

• Replaced ellipses "..." with a "More" label (can be changed to something else. Maybe "Actions" or "Commands")
• Added a textblock for Ctrl + K shortcut
• Removed tooltip that showed Ctrl + K shortcut when hovering over previous "..."

Special Note:

• The InfoBar.Severity binding was temporarily commented out because of a built-time error even though 'State' property is present in the ViewModel. Happy to revisit this if the team can help/confirm the intended binding context/behavior

Before change:

After change:

Closes #39501

[brianjames-dev]

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