Newsletter status check new implementation

[mdanilowicz]

Technical TODO

Implement changes to handle the new way of checking newsletter status https://github.com/shopware/shopware/pull/14653/changes#diff-849f8a91c13b4fae40ef5dacbdac0248fed11f640273356aaa2434293dc9d7f3

[mdanilowicz]

waiting for shopware/shopware#14653 to be merged. Currently, it is not merged into the 6.7.8.0 or 6.7.8.1