add support for multiple workspaces in one import file

[jackkav]

add support for multiple workspaces in one import file

highlights

• removes project and workspace selection, in favour of context and duplication of workspaces
• removes import api spec import as a copy and paste would suffice
• when importing from a run button, its possible to include no project or workspace so we should fallback to the default project and create a new workspace using a title found in the import file.
• fixes incorrect logic which was importing collections as design documents
• you can now import a whole project backup into an existing project, duplicating any already existing resources.
• moves code coverage behind a CI flag

todo

• fix export file name
• remove selects
• update scan results for multiple workspaces
• update project name in title and labels to indicate context
• remove workspace name override
• decide on iteration approach to actual import

closes INS-2660
changelog(Improvements): Added support for importing multiple workspaces from one file.