Replace deprecated --control-medium-lineBoxHeight with --base-size-20 (#4034)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lukasoppermann <813754+lukasoppermann@users.noreply.github.com>

Author: Copilot

app/components/primer/alpha/action_list.pcss

@@ -557,7 +557,7 @@ nav-list {
 .ActionListItem-visual,
 .ActionListItem-action {
   display: flex;
-  min-height: var(--control-medium-lineBoxHeight);
+  min-height: var(--base-size-20);
   color: var(--fgColor-muted);
   pointer-events: none;
   fill: var(--fgColor-muted);

app/components/primer/beta/state.pcss

@@ -10,7 +10,7 @@
   font-size: var(--text-body-size-medium);
   font-weight: var(--base-text-weight-medium);
   /* stylelint-disable-next-line primer/typography */
-  line-height: var(--control-medium-lineBoxHeight);
+  line-height: var(--base-size-20);
   text-align: center;
   white-space: nowrap;
   /* stylelint-disable-next-line primer/borders */
@@ -21,7 +21,6 @@
 .State,
 .State--draft {
   color: var(--fgColor-onEmphasis);
-  /* stylelint-disable-next-line primer/colors */
   background-color: var(--bgColor-draft-emphasis, var(--bgColor-neutral-emphasis));
   border: var(--borderWidth-thin) solid transparent;
   box-shadow: var(--boxShadow-thin) var(--borderColor-draft-emphasis, var(--borderColor-neutral-emphasis));