Unsupported content types cannot be added to libraries

[jmakowski1123]

When a user tries to paste an unsupported content type into a Library, the content will not be added to the Library and the user will encounter a message.

Which content will not be supported?

• ORA block
• advanced block types

Message: Libraries do not support this type of content yet.

UI Need: Modal with message

[bradenmacdonald]

Noting that this is the opposite of #1093 and assumes we're not able to get that one done for MVP.