feat: [Channel] Add support for primary_admin_email as customer_identity for ImportCustomer #84

Job	Run time
PHP 8.0 Unit Test (ubuntu-latest)	4m 42s
PHP 8.1 Unit Test (ubuntu-latest)	5m 47s
PHP 8.2 Unit Test (ubuntu-latest)	5m 11s
PHP 8.3 Unit Test (ubuntu-latest)	5m 12s
PHP 8.0 Unit Test (windows-latest)	7m 18s
PHP 8.1 Unit Test (windows-latest)	9m 34s
PHP 8.2 Unit Test (windows-latest)	9m 37s
PHP 8.3 Unit Test (windows-latest)	9m 15s
Dev Commands Unit Tests	31s
PHP 8.0 Unit Test + protobuf extension (ubuntu-latest)	4m 14s
Package Tests	13m 42s
Package Tests (Lowest Dependencies)	10m 56s
	1h 25m 59s

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