Remove unused icon references

src/vs/workbench/browser/parts/panel/media/chevron-left-dark.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M5.92809 7.97603L10.2854 12.3333L9.66668 12.9521L5.00001 8.28539V7.66667L9.66668 3L10.2854 3.61872L5.92809 7.97603Z" fill="#C5C5C5"/>
-</svg>

src/vs/workbench/browser/parts/panel/media/chevron-left-hc.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M5.92809 7.97603L10.2854 12.3333L9.66668 12.9521L5.00001 8.28539V7.66667L9.66668 3L10.2854 3.61872L5.92809 7.97603Z" fill="white"/>
-</svg>

src/vs/workbench/browser/parts/panel/media/chevron-left-light.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M5.92809 7.97603L10.2854 12.3333L9.66668 12.9521L5.00001 8.28539V7.66667L9.66668 3L10.2854 3.61872L5.92809 7.97603Z" fill="#424242"/>
-</svg>

src/vs/workbench/browser/parts/panel/media/chevron-right-dark.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M10.0719 7.99999L5.7146 12.3573L6.33332 12.976L11 8.30935V7.69063L6.33332 3.02396L5.7146 3.64268L10.0719 7.99999Z" fill="#C5C5C5"/>
-</svg>

src/vs/workbench/browser/parts/panel/media/chevron-right-hc.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M10.0719 7.99999L5.7146 12.3573L6.33332 12.976L11 8.30935V7.69063L6.33332 3.02396L5.7146 3.64268L10.0719 7.99999Z" fill="white"/>
-</svg>

src/vs/workbench/browser/parts/panel/media/chevron-right-light.svg

-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path fill-rule="evenodd" clip-rule="evenodd" d="M10.0719 7.99999L5.7146 12.3573L6.33332 12.976L11 8.30935V7.69063L6.33332 3.02396L5.7146 3.64268L10.0719 7.99999Z" fill="#424242"/>
-</svg>

src/vs/workbench/browser/parts/panel/media/panelpart.css

@@ -123,55 +123,3 @@
 	min-width: 110px;
 	margin-right: 10px;
 }
-
-/* Up */
-.monaco-workbench .maximize-panel-action {
-	background-image: url('chevron-up-light.svg');
-}
-
-.vs-dark .monaco-workbench .maximize-panel-action {
-	background-image: url('chevron-up-dark.svg');
-}
-
-.hc-black .monaco-workbench .maximize-panel-action {
-	background-image: url('chevron-up-hc.svg');
-}
-
-/* Down */
-.monaco-workbench .minimize-panel-action {
-	background-image: url('chevron-down-light.svg');
-}
-
-.vs-dark .monaco-workbench .minimize-panel-action {
-	background-image: url('chevron-down-dark.svg');
-}
-
-.hc-black .monaco-workbench .minimize-panel-action {
-	background-image: url('chevron-down-hc.svg');
-}
-
-/* Left */
-.monaco-workbench .panel.right .maximize-panel-action {
-	background-image: url('chevron-left-light.svg');
-}
-
-.vs-dark .monaco-workbench .panel.right .maximize-panel-action {
-	background-image: url('chevron-left-dark.svg');
-}
-
-.hc-black .monaco-workbench .panel.right .maximize-panel-action {
-	background-image: url('chevron-left-hc.svg');
-}
-
-/* Right */
-.monaco-workbench .panel.right .minimize-panel-action {
-	background-image: url('chevron-right-light.svg');
-}
-
-.vs-dark .monaco-workbench .panel.right .minimize-panel-action {
-	background-image: url('chevron-right-dark.svg');
-}
-
-.hc-black .monaco-workbench .panel.right .minimize-panel-action {
-	background-image: url('chevron-right-hc.svg');
-}