Personal Data Export email unit tests found in erasure fulfillment

[garrett-eclipse]

Hello,

While working on #44721 and #46056 I found there's some unit tests for the erasure fulfillment email that aren't covered in the data export email. Specifically, the test on post_type and post_status found here;
​https://github.com/WordPress/wordpress-develop/blob/5.1.1/tests/phpunit/tests/privacy/wpPrivacySendErasureFulfillmentNotification.php#L240-L277

We should be checking these to have consistent coverage between unit test suites for the two similar emails.

Cheers