Extract pages domain specs from pages_spec and pages_letsencryp_spec feature specs
The following discussion from !19608 (merged) should be addressed:
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@vshushlin started a discussion: This is kind of a dirty hack, the better way will be to actually rewrite these specs a bit to have a different context for with/without Let's Encrypt enabled.
But I don't want to refactor these specs right now to avoid massive conflict with WIP: !16687 (merged).
I will create a follow-up issue for this