Adds an "X" button to remove individual commands from the Command Palette's "recently used" section. Button appears only for recently used items, positioned rightmost after the existing "Configure Keybinding" button.

Changes

src/vs/platform/quickinput/browser/commandsQuickAccess.ts:

• Added CommandsHistory.remove() method to delete entries from LRU cache
• Modified _getPicks() to use isInHistory to identify recently used items
• Updated toCommandPick() to:
  • Accept isRecentlyUsed parameter (passed as isInHistory)
  • Append close button with "Remove from Recently Used" tooltip for recently used items only
  • Implement trigger handler that calls commandsHistory.remove() and returns TriggerAction.REMOVE_ITEM

Button uses Codicon.close icon, positioned as last button element (rightmost). Follows existing pattern from "Remove from Recently Opened" in file picker.

Fixes #issue_number

<issue_title>Add "X" button to remove command from "recently used" list in Command Palette</issue_title>
><issue_description>The Command Palette in VS Code keeps track of the top 50 most recently used commands used, and shows them at the top of the filtered commands lists if they apply to the given search. There should be an X button next to each Command Palette item in the "recently used" quickpick section. The X button should show the tooltip "Remove from recently used", properly localized. This button should not appear for items in sections "other commands" nor "similar commands".</issue_description>
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• Fixes Add "X" button to remove command from "recently used" list in Command Palette #277311

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