assistant: Refine workflow step labels (#16161)

https://github.com/user-attachments/assets/f6325507-091a-482e-ac28-dd09877ebaa2


Release Notes:

- N/A

---------

Co-authored-by: Danilo <daniloleal09@gmail.com>

crates/ui/src/components/icon.rs

@@ -254,7 +254,6 @@ pub enum IconName {
     Tab,
     Terminal,
     TextCursor,
-    TextSearch,
     Trash,
     TriangleRight,
     Undo,
@@ -418,7 +417,6 @@ impl IconName {
             IconName::Tab => "icons/tab.svg",
             IconName::Terminal => "icons/terminal.svg",
             IconName::TextCursor => "icons/text-cursor.svg",
-            IconName::TextSearch => "icons/text-search.svg",
             IconName::Trash => "icons/trash.svg",
             IconName::TriangleRight => "icons/triangle_right.svg",
             IconName::Update => "icons/update.svg",