Imports / Exports in Rails Cheatsheet is outdated per updates made in 12.1

Problem to solve

Further details

Proposal

Currently, our cheatsheet reflects this code snippet to check for Import/Export errors:

# Find the project and get the error
p = Project.find_by_full_path('<username-or-group>/<project-name>')

p.import_error

# To finish the import on GitLab running version before 11.6
p.import_finish

# To finish the import on GitLab running version 11.6 or after
p.import_state.mark_as_failed("Failed manually through console.")

As of 12.1, the column that allowed us to call the attribute :import_error was removed per this Merge Request.

We should remove this section and replace with a redirect to the Project import status API.

Who can address the issue

Other links/references

Discovered when working on this ticket (ZD Internal)