Revert "Drop unused ActivityComponent (#3024)" (#3117)

This reverts commit bd06e6d4dc.

src/main/scala/gitbucket/core/model/Activity.scala

@@ -1,5 +1,20 @@
 package gitbucket.core.model
 
+/**
+ * ActivityComponent has been deprecated, but keep it for binary compatibility.
+ */
+@deprecated("ActivityComponent has been deprecated, but keep it for binary compatibility.", "4.34.0")
+trait ActivityComponent extends TemplateComponent { self: Profile =>
+  import profile.api._
+  import self._
+
+  lazy val Activities = TableQuery[Activities]
+
+  class Activities(tag: Tag) extends Table[Activity](tag, "ACTIVITY") with BasicTemplate {
+    def * = ???
+  }
+}
+
 case class Activity(
   userName: String,
   repositoryName: String,

src/main/scala/gitbucket/core/model/Profile.scala

@@ -47,6 +47,7 @@ trait CoreProfile
     with Profile
     with AccessTokenComponent
     with AccountComponent
+    with ActivityComponent
     with CollaboratorComponent
     with CommitCommentComponent
     with CommitStatusComponent