Revise and clean up some icons (#35582)

This is really just a small beginning, as there are many other icons to
be revised and cleaned up. Our current set is a bit of a mess in terms
of dimension, spacing, stroke width, and terminology. I'm sure there are
more non-used icons I'm not covering here, too. We'll hopefully tackle
it all soon leading up to 1.0.

Closes https://github.com/zed-industries/zed/issues/35576

Release Notes:

- N/A

crates/language_tools/src/lsp_tool.rs

@@ -1015,7 +1015,7 @@ impl Render for LspTool {
                 .anchor(Corner::BottomLeft)
                 .with_handle(self.popover_menu_handle.clone())
                 .trigger_with_tooltip(
-                    IconButton::new("zed-lsp-tool-button", IconName::Bolt)
+                    IconButton::new("zed-lsp-tool-button", IconName::BoltOutlined)
                         .when_some(indicator, IconButton::indicator)
                         .icon_size(IconSize::Small)
                         .indicator_border_color(Some(cx.theme().colors().status_bar_background)),