Method getMockForAbstractClass() is deprecated - replace in views plugins

Seems like a good refactor.

Wonder eventually if it should be documented somewhere all these Stubs?

Needs a rebase for the phpstan baseline.

rebased

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rebased

@mondrake, thanks for keeping this up to date.

Committed to 11.x and cherry-picked to 11.1.x

Thanks!

quietone → closed merge request !9833