Disable ctrl+k for clear terminal on Linux

This conflicts with native keybinding to clear to the end of the prompt

Fixes #19248

src/vs/workbench/parts/terminal/electron-browser/terminal.contribution.ts

@@ -233,5 +233,6 @@ actionRegistry.registerWorkbenchAction(new SyncActionDescriptor(ScrollToTopTermi
 	linux: { primary: KeyMod.Shift | KeyCode.Home }
 }, KEYBINDING_CONTEXT_TERMINAL_FOCUS), 'Terminal: Scroll to Top', category);
 actionRegistry.registerWorkbenchAction(new SyncActionDescriptor(ClearTerminalAction, ClearTerminalAction.ID, ClearTerminalAction.LABEL, {
-	primary: KeyMod.CtrlCmd | KeyCode.KEY_K
+	primary: KeyMod.CtrlCmd | KeyCode.KEY_K,
+	linux: { primary: null }
 }, KEYBINDING_CONTEXT_TERMINAL_FOCUS, KeybindingsRegistry.WEIGHT.workbenchContrib(1)), 'Terminal: Clear', category);