[NFC] Add some email processor hooks tests

[demeritcowboy]

Overview

There aren't any

Before

There aren't any

After

More tests!

Technical Details

Comments

Ref: #26905

[civibot]

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[totten]

Seems like a good idea. Agree it's NFC since it only adds tests.

[demeritcowboy]

Thanks.
Same unrelated fail that's on every PR lately.