MM-25394 session expired push notifications (#14732)

* new job type created that checks for expired mobile sessions and pushes notifications.

* only send session expired notifications if ExtendSessionLengthWithActivity is enabled.

* includes schema change:  field added to Sessions table

einterfaces/mocks/LdapInterface.go

@@ -289,3 +289,8 @@ func (_m *LdapInterface) SwitchToLdap(userId string, ldapId string, ldapPassword
 
 	return r0
 }
+
+// UpdateProfilePictureIfNecessary provides a mock function with given fields: _a0, _a1
+func (_m *LdapInterface) UpdateProfilePictureIfNecessary(_a0 *model.User, _a1 *model.Session) {
+	_m.Called(_a0, _a1)
+}