Triger task

Acceptance criteria​
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If reference object gets created for the first time and there are no other working places for this contact isPrimary=true.​
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If Isprimary was changed from ‘true’ to ‘false’, ‘true’ should be set on the last workplace(use created date field on reference object).​
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If Isprimary was changed from ‘false’ to ‘true’, Isprimary should be unchecked from last primary workplace (use created date field on reference object).​
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Considerations:​
only one primary workplace is allowed for one contact​
*bulkification should be taken into consideration. I.e. insert, update list of references. ​
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