EZP-23338: Handled asyncpub redirect from preview

The operation's result wasn't checked, always triggering
the default behaviour.
REST siteaccess can be set via X-Siteaccess header
Merge branch 'EZP-23277-rest_siteaccess'
Merge branch 'EZP-23338-asyncpub_redirect_from_preview'
Revert "Fixed bug #017219: Policy "section/assign" does not uphold subtree limitation"

This reverts commit cef569909821cbf393620244ba48a14328b88c53.
Fix EZP-23341: incorrect subtree limitation check in section/assign
Merge pull request #1071 from joaoinacio/EZP-23341_section_assign_subtree

Fix EZP-23341: incorrect subtree limitation check in section/assign
Fix EZP-23348: Misleading error message on deleted embed objects
Merge pull request #1076 from ezsystems/ezp-23348_deleted_embed_error_message

Fix EZP-23348: Misleading error message on deleted embed objects