Improve test case for Issue1888

[Deepskyhunter]

Shortened the due_date different between experiments
Record and compare the order by the time it finished all stage and deleted item of rid 1 and 2

ARTIQ Pull Request

Description of Changes

Changed the test case.

1. Reduced time different between early and late
2. Record the RID when the item is finished and deleted
3. Compare the resulted RID order with the expected one.

Related Issue #1888

Type of Changes

	Type
✓	🐛 Bug fix

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[sbourdeauducq]

Reduced time different between early and late

Why?

[Deepskyhunter]

The previous time() + 100000 was meant not to be finished and therefore the expect case didn't have RID 1 and call a stop after deleting RID 2.
The current changes include RID 1 into the expect case [2,1] to make it clear RID 2 is run before RID 1.
Reduced time different can reduce the time for testing while the priority still hold valid.

Alternative is call a stop when RID 2 is deleted and revert the time different.

[sbourdeauducq]

This check is a bit loose. The comment called for a check that the Experiment goes through all stages, not just that it gets deleted.

And if we start having code that interprets the scheduler events in this way, this raises the question of whether we should refactor the other tests to also use it.

[sbourdeauducq]

The previous time() + 100000 was meant not to be finished and therefore the expect case didn't have RID 1 and call a stop after deleting RID 2.
The current changes include RID 1 into the expect case [2,1] to make it clear RID 2 is run before RID 1.

Then it seems you are not testing the same thing anymore?