feat(849): currate stdout and stderr in "core"

api/graphql/graphql_test.go

api/http/git_file_handlers_test.go

bridge/github/export_test.go

bridge/github/import_integration_test.go

bridge/github/import_test.go

bridge/gitlab/export_test.go

bridge/gitlab/import_test.go

cache/multi_repo_cache.go

cache/repo_cache.go

cache/repo_cache_test.go

cache/repo_cache_testing.go

commands/env.go

commands/env_testing.go

commands/select/select_test.go

commands/webui.go