Improve assert for ReturnToHomeMissionIsStartedIfQueueIsEmptyWhenRobotBecomesAvailable

[oysand]

Describe the improvement you would like to see The test currently only assert that there is no ongoing mission, which does not take into account whether or not the previous completed mission run was a return to home mission.

See: https://github.com/equinor/flotilla/blob/main/backend/api.test/EventHandlers/TestMissionEventHandler.cs

            // Assert
            Thread.Sleep(1000);
            var ongoingMission = await _missionRunService.ReadAll(
                new MissionRunQueryStringParameters
                {
                    Statuses = [
                        MissionStatus.Ongoing
                    ],
                    OrderBy = "DesiredStartTime",
                    PageSize = 100
                });
            Assert.False(ongoingMission.Any());
        }

How will this change existing functionality? More accurate tests

How will this improvement affect the current Threat Model? N/A

[aeshub]

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