Add label key to style group definition

1. +++ b/modules/paragraphs_collection_test/paragraphs_collection_test.paragraphs.style_group.yml
   @@ -2,6 +2,7 @@ regular_test_group:
    bold_test_group:
      label: 'Bold Test Group'
   +  context_label: 'Bold CONTEXT'
    italic_test_group:
   

   Hm, not sure about the key. Maybe widget_label?

2. +++ b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
   @@ -115,9 +115,14 @@ class ParagraphsStylePlugin extends ParagraphsBehaviorBase implements ContainerF
   +        $title = $this->t('%group style', ['%group' => $this->yamlStyleDiscovery->getGroupLabel($group_id)]);
   +        // If there is a context label use it without adding a "Style" suffix.
   +        if ($group_label = $this->yamlStyleDiscovery->getGroupContextLabel($group_id)) {
   +          $title = $this->t('%group', ['%group' => $group_label]);
   +        }
   

   this means you're doing the work twice, use an if/else instead.

3. +++ b/src/Plugin/paragraphs/Behavior/ParagraphsStylePlugin.php
   @@ -290,8 +295,12 @@ class ParagraphsStylePlugin extends ParagraphsBehaviorBase implements ContainerF
   +          // If there is not a context label, use the group label instead.
   +          if (!$group = $this->yamlStyleDiscovery->getGroupContextLabel($group_id)) {
   +            $group = $this->yamlStyleDiscovery->getGroupLabel($group_id);
   +          }
              $summary[] = $this->t('@group: @style', [
   -            '@group' => $this->yamlStyleDiscovery->getGroupLabel($group_id),
   +            '@group' => $group,
   

   hm, above you call it $title, here $group and the key/method is label. I'd use $label in both.

   Having to duplicate this logic if trying multiple labels makes me sad, but it's tricky as above we have it combined with " style" and here we don't. But actually, that is kind of strange, as the shortened label here without style suffix possibly not enough context.

   Wondering if we should just drop the style sufffix completely and simply add it to the group labels where we want to have it. Downside is that we would have a bit of duplication then in places like the style overview. Or we would alternatively add " style" also here, then we could do getGroupWidgetLabel() that would return the widget_label or fallback to "$label style"?

4. +++ b/src/StyleDiscovery.php
   @@ -274,10 +277,33 @@ class StyleDiscovery implements StyleDiscoveryInterface {
   +    if (in_array($group_id, array_keys($groups))) {
   +      return $groups[$group_id]['context_label'];
        }
        return NULL;
   

   Or you could just do a isset($groups[$group_id]) ;)

Thanks. Committed.