As a user, I can export manual Test cases in a CSV layout compatible with Test Case Importer

As a user, I can export manual Test cases in a CSV layout compatible with Test Case Importer, so that it can be used afterwards to update existing test cases (or even create them in another instance).

ACs:

• user should be able to export a bunch of manual Tests to Test Case Importer's CSV layout, from the issue search page, using a bulk operation
• only manual tests should be considered whenever exporting to CSV
• it should be possible to export using all visible columns or reuse a Test Case Importer configuration file saved previously in an import operation