feat(handlers): expose migration_error to GET import route

See merge request !962

fix(handlers): update import status when failed with a different context

See merge request !958

fix: cleanup migration error when retrying a failed import

See merge request !960

test: fix PreImport_Retry expected migration_error

See merge request !965

feat(handlers): force final import cancellation

See merge request !959

# [3.38.0](v3.37.1-gitlab...v3.38.0-gitlab) (2022-04-07)

### Bug Fixes

* cleanup migration error when retrying a failed import ([b749274a](b749274a))
* **handlers:** update import status when failed with a different context ([e3e7c1fc](e3e7c1fc))

### Features

* **handlers:** expose migration_error to GET import route ([37af5498](37af5498))
* **handlers:** force final import cancellation ([becaea69](becaea69))