fix: made CMSEditLinkExtension work with Hierarchy, added dynamic get…

[tiller1010]

…CMSEditOwnerRelation method

Closes #1628

• create a has_many relationship on a dataobject with a dataobject that uses the Hierarchy extension: CMSEditLinkExtension doesn't work with Hierarchy #1628 (comment)
• add a cms field to your Hierarchy dataobject to set the ParentID
• confirm saving the dataobject after changing the parentid properly redirects you to the cms edit link

[GuySartorelli]

Tha k you contributing - however based on the information in the original issue, this does work correctly with the hierarchy extension, but doesn't support having different parents. I don't think we want support for that at this level. Instead, the getCMSEditOwner() method should be overridden dynamically return the correct owner based on project logic.

[tiller1010]

based on the information in the original issue, this does work correctly with the hierarchy extension

No, this PR calls AllChildren() instead of hasMany for Hierarchy relations.