Remove unused classes from ProgressBar CSS Module (#6814)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: mperrotti

packages/react/src/ProgressBar/ProgressBar.module.css

@@ -9,6 +9,10 @@
 }
 
 .ProgressBarItem {
+  /* these are passed from the component */
+  --progress-width: ;
+  --progress-bg: ;
+
   width: var(--progress-width);
   /* stylelint-disable-next-line primer/colors */
   background-color: var(--progress-bg);
@@ -49,13 +53,4 @@
   &:where([data-progress-bar-size='large']) {
     height: 10px;
   }
-
-  /* Width support for containers */
-  &:where([data-width='auto']) {
-    width: auto;
-  }
-
-  &:where([data-width='full']) {
-    width: 100%;
-  }
 }