[JENKINS-75350] Displays plugin health score in Plugin Manager (#10351)

Co-authored-by: Markus Winter <m.winter@sap.com>
Co-authored-by: Tim Jacomb <21194782+timja@users.noreply.github.com>
Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>
Co-authored-by: Daniel Beck <daniel-beck@users.noreply.github.com>

core/src/main/java/hudson/PluginWrapper.java

@@ -222,6 +222,8 @@ public class PluginWrapper implements Comparable<PluginWrapper>, ModelObject {
      */
     private static Set<String> CORE_ONLY_DEPENDANT = Set.of("jenkins-core");
 
+    private Integer healthScore;
+
     /**
      * Set the list of components that depend on this plugin.
      * @param dependents The list of components that depend on this plugin.
@@ -423,6 +425,32 @@ public class PluginWrapper implements Comparable<PluginWrapper>, ModelObject {
 
     }
 
+    @Restricted(NoExternalUse.class) // Jelly use only
+    public Integer getHealthScore() {
+        if (this.healthScore == null) {
+            this.healthScore = getInfoFromAllSites().stream()
+                    .filter(Objects::nonNull)
+                    .filter(p -> p.healthScore != null)
+                    .findFirst()
+                    .map(plugin -> plugin.healthScore)
+                    .orElse(null);
+        }
+        return this.healthScore;
+    }
+
+    @Restricted(NoExternalUse.class)
+    public static String getHealthScoreClassForScore(int score) {
+        if (score > 80) return "top";
+        if (score > 60) return "middle";
+        return "bottom";
+    }
+
+    @Restricted(NoExternalUse.class) // Jelly use only
+    public String getHealthScoreClass() {
+        if (this.healthScore == null) return null;
+        return getHealthScoreClassForScore(this.healthScore);
+    }
+
     @ExportedBean
     public static final class Dependency {
         @Exported