[DELEGATION] Edit attendance and events, delete event for someone (#553)

* [#523] added way to manage attendance for delegated calendars

* [DELEGATION] #523 & #524 changed eventURL calculation for delegated events to have the rigth one

* [#524] added drag and drop authorisation to delegated event

* [#524] added tests

* [#524] support for the permission access

* [#524] no edit when delegated event is not public

__test__/components/CalendarSelection.test.tsx

@@ -24,20 +24,20 @@ describe("CalendarSelection", () => {
       name: "Calendar personal",
       id: "user1/cal1",
       color: "#FF0000",
-      ownerEmails: ["alice@example.com"],
+      owner: { emails: ["alice@example.com"] },
     },
     "user2/cal1": {
       name: "Calendar delegated",
       delegated: true,
       id: "user2/cal1",
       color: "#00FF00",
-      ownerEmails: ["bob@example.com"],
+      owner: { emails: ["bob@example.com"] },
     },
     "user3/cal1": {
       name: "Calendar shared",
       id: "user3/cal1",
       color: "#0000FF",
-      ownerEmails: ["charlie@example.com"],
+      owner: { emails: ["charlie@example.com"] },
     },
   };
   beforeAll(() => {