Content View Versions generated by Export are still listed in Composite page
- Export a few repos/library
- Create a composite content view
- In the composite details of this click the "Content Views" tab.
- Notice how `Export-*` versions are listed there.
No export generated cvvs are to displayed (since they are not meant to be used with Composites).
When we ask for a list of component cvv's available for a composite, the
backend api also returns componenet cvvs that are from export/import
generated content views (like export-library/export-repository) etc.
These versions are not meant to be included in the composite.
This commit changes this behavior by filtering out generated content
views all together.
Also adds validation to not add generated content view versions to a