feat(list-item-group): update list item group styles (#9072)

**Related Issue:** #8039

## Summary

- update list item group styles
- updates internal table cell classes to remove padding being set by
default browser styles.

packages/calcite-components/src/components/list-item-group/list-item-group.scss

@@ -10,10 +10,11 @@
 @include disabled();
 
 .container {
-  @apply bg-foreground-2 text-n1 text-color-2 m-0 flex flex-1 p-3 font-sans font-bold;
+  @apply text-n1 text-color-2 m-0 flex flex-1 p-3 font-sans font-medium;
 }
 
 .heading {
+  @apply p-0;
   padding-inline-start: calc(
     var(--calcite-list-item-spacing-indent) * var(--calcite-list-item-spacing-indent-multiplier)
   );

packages/calcite-components/src/components/list-item/list-item.scss

@@ -137,7 +137,7 @@ td:focus {
 }
 
 .selection-container {
-  @apply flex px-3;
+  @apply flex px-3 py-0;
   color: theme("borderColor.color.input");
 }
 
@@ -187,6 +187,7 @@ td:focus {
 
 .actions-start,
 .actions-end {
+  @apply p-0;
   ::slotted(calcite-action),
   ::slotted(calcite-action-menu),
   ::slotted(calcite-handle),