Merge pull request #32540 from eileenmcnaughton/cust_swap

CRM/Custom/Import/Form/MapField.php

CRM/Custom/Import/Parser/Api.php

CRM/Event/Import/Form/MapField.php

CRM/Event/Import/Parser/Participant.php

CRM/Import/Form/MapField.php

CRM/Import/Parser.php

CRM/Member/Import/Form/MapField.php

ext/civiimport/CRM/CiviImport/Form/MapField.php

ext/civiimport/civiimport.php

...phpunit/CRM/Contribute/Import/Parser/ContributionTest.php

tests/phpunit/CRM/Custom/Import/Parser/ApiTest.php

tests/phpunit/CRM/Event/Import/Parser/ParticipantTest.php

tests/phpunit/CRM/Member/Import/Parser/MembershipTest.php

tests/phpunit/CRMTraits/Import/ParserTrait.php