Do not run refresh_member_authorized_projects callback when importing

What does this MR do?

This MR:

• Disables callback refresh_member_authorized_projects when importing a group or project due to the fact that it can cause import to take significantly longer. Refresh of authorizations is not needed to be done during the import for each individual member
• Enqueue async AuthorizedProjectUpdate::ProjectRecalculateWorker instead at the end when import is finished in the after import hook. This ensures authorizations are updated still updated, but it's done in scope of 1 sidekiq job
• Callback is also disabled for Group Import, since during group import there are no projects in the groups, so there is no point in executing this callback

More details in #334627 (closed)

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