agent: Make all icons used for tool calls consistent (#34160)

Starting to use the `Tool...` family of icons dedicated & designed for
the agent panel.

Release Notes:

- N/A

crates/icons/src/icons.rs

@@ -66,7 +66,6 @@ pub enum IconName {
     Circle,
     CircleOff,
     CircleHelp,
-    Clipboard,
     Close,
     Cloud,
     Code,
@@ -118,7 +117,6 @@ pub enum IconName {
     File,
     FileCode,
     FileCreate,
-    FileDelete,
     FileDiff,
     FileDoc,
     FileGeneric,
@@ -215,7 +213,6 @@ pub enum IconName {
     Scissors,
     Screen,
     ScrollText,
-    SearchCode,
     SearchSelection,
     SelectAll,
     Send,
@@ -254,8 +251,12 @@ pub enum IconName {
     ThumbsDown,
     ThumbsUp,
     ToolBulb,
+    ToolCopy,
+    ToolDeleteFile,
+    ToolDiagnostics,
     ToolFolder,
     ToolHammer,
+    ToolNotification,
     ToolPencil,
     ToolRegex,
     ToolSearch,