Add test for system available for mission logic

[aeshub]

Ready for review checklist:

• A self-review has been performed
• All commits run individually
• Temporary changes have been removed, like console.log, TODO, etc.
• The PR has been tested locally
• A test have been written
  • This change doesn't need a new test
• Relevant issues are linked
• Remaining work is documented in issues
  • There is no remaining work from this PR that require new issues
• The changes does not introduce dead code as unused imports, functions etc.

[Christdej]

Should we add

Suggested change

	[InlineData(false, MissionRunType.Normal, RobotStatus.Available, true, true, false)]
	[InlineData(false, MissionRunType.Normal, RobotStatus.Available, true, true, false)]
	[InlineData(false, MissionRunType.Emergency, RobotStatus.Busy, true, false, true)]

?

[aeshub]

Interestingly enough this test returns false. Meaning it is not possible to schedule an emergency mission through this logic while the robot is busy, but it might be the current implementation means we stop the current mission first and then we allow the emergency mission to run because the robot is then available. Will investigate a bit more as it would have been great to keep all the logic within this function if feasible.