Revert "BACKLOG-5352: Add import export unit test"

This reverts commit ae5f79b771620c63f92f9f83cb3fdaf12133e265.
Revert "BACKLOG-5258 : add missing mixinTypes property"

This reverts commit e0bfad4576b2f9e1f028071a315d3f9fb6671812.
Revert "BACKLOG-5254 : added more tests on canExportNode/Property"

This reverts commit d2e55ea84fd7523e5ac8a3caa13ad7a6ebca589c.
Revert "BACKLOG-5259: Backport mount point changes from 7.1 made in BACKLOG-3172 and BACKLOG-5253"

This reverts commit cbd6446f1f2d0c5bac3b633463abb320ea000fd8, reversing
changes made to 64d743f32cfe62c201cbb9d849669a06413c5d31.