[PHPUnit 10] Provide a static alternative to ConfigMapperManagerTest::providerTestHasTranslatable

Problem/Motivation

PHPUnit 10 deprecates use of non-static @dataProvider methods. This means that @dataProvider methods can no longer make calls to non-static methods. Any non-static call ($this->someMethod()) needs to be replaced by a call to a static alternative (static::someOtherMethod()), that would have to be implemented if not available.

In this issue, focus on replacing ConfigMapperManagerTest::providerTestHasTranslatable()

Proposed resolution

I cannot find an easy way to use PHPUnit mocks in data providers when they're static. Here I suggest to convers usage of a PHPUnit mocks to PHPSpec prophecies instead.

Let's see how this goes and then work on others.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet