Live location sharing: only share to beacons created on device (#8378)

* create live beacons in ownbeaconstore and test

Signed-off-by: Kerry Archibald <kerrya@element.io>

* more mocks in RoomLiveShareWarning

Signed-off-by: Kerry Archibald <kerrya@element.io>

* extend mocks in components

Signed-off-by: Kerry Archibald <kerrya@element.io>

* comment

Signed-off-by: Kerry Archibald <kerrya@element.io>

* remove another comment

Signed-off-by: Kerry Archibald <kerrya@element.io>

* extra ? hedge in roommembers change

Signed-off-by: Kerry Archibald <kerrya@element.io>

* listen to destroy and prune local store on stop

Signed-off-by: Kerry Archibald <kerrya@element.io>

* tests

Signed-off-by: Kerry Archibald <kerrya@element.io>

* update copy pasted copyright to 2022

Signed-off-by: Kerry Archibald <kerrya@element.io>

test/components/views/beacon/RoomLiveShareWarning-test.tsx

@@ -93,10 +93,20 @@ describe('<RoomLiveShareWarning />', () => {
         return component;
     };
 
+    const localStorageSpy = jest.spyOn(localStorage.__proto__, 'getItem').mockReturnValue(undefined);
+
     beforeEach(() => {
         mockGeolocation();
         jest.spyOn(global.Date, 'now').mockReturnValue(now);
         mockClient.unstable_setLiveBeacon.mockReset().mockResolvedValue({ event_id: '1' });
+
+        // assume all beacons were created on this device
+        localStorageSpy.mockReturnValue(JSON.stringify([
+            room1Beacon1.getId(),
+            room2Beacon1.getId(),
+            room2Beacon2.getId(),
+            room3Beacon1.getId(),
+        ]));
     });
 
     afterEach(async () => {
@@ -106,6 +116,7 @@ describe('<RoomLiveShareWarning />', () => {
 
     afterAll(() => {
         jest.spyOn(global.Date, 'now').mockRestore();
+        localStorageSpy.mockRestore();
     });
 
     const getExpiryText = wrapper => findByTestId(wrapper, 'room-live-share-expiry').text();