fix(plugins/plugin-client-common): popover has odd spacing and overflow

Fixes #6809

Author: myan9

plugins/plugin-client-common/web/scss/components/Popover/PatternFly.scss

@@ -18,6 +18,15 @@
 @import 'mixins';
 
 @include Popover {
+  h6 {
+    margin-top: 0;
+  }
+
+  .pf-c-popover__content {
+    max-height: 40rem; /* Neither PatternFly nor Carbon let us specify this via props */
+    overflow-y: auto;
+  }
+
   .pf-c-button {
     padding: 0;
   }

plugins/plugin-client-common/web/scss/components/Popover/common.scss

@@ -20,8 +20,6 @@ body[kui-theme-style] {
   @include Popover {
     min-width: 5rem;
     max-width: 23rem; /* Carbon does not let us specify this easily via props */
-    max-height: 40rem; /* Neither PatternFly nor Carbon let us specify this via props */
-    overflow-y: auto;
   }
 }