Use chandra_limits to obtain limits, fix failing tests due to other ska updates

[jzuhone]

Description

The chandra_limits package is now operational. There is a function get_acis_limits that now no longer exists in acis_thermal_check, which was being used in acispy to obtain limits for the SimulateECSRun class. The fact that this function no longer exists was causing ImportErrors.

This PR removes the faulty import and fixes SimulateECSRun to use the new chandra_limits way of obtaining the limits.

Two other tests were failing because of recent updates to kadi, which resulted in very small changes to temperature predictions. These predictions have been updated since the reason is known. Another test was failing due to a change in xija, and it has been updated to pass.

Interface impacts

None

Testing

Unit tests

• No unit tests
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Independent check of unit tests by [REVIEWER NAME]

• [PLATFORM]:

Functional tests

Ran a few instances of SimulateECSRun to make sure it ran correctly.

[jazan12]

Looks good to me.

[Gregg140]

Looks very good. Thanks for the fix.

[jeanconn]

@jzuhone Does this update also need to be in the ska3 release to support the new ACIS FP limits or is this unrelated?