cmd/go: TestScript/mod_list_bad_import failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/mod_list_bad_import"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/mod_list_bad_import
=== PAUSE TestScript/mod_list_bad_import
=== CONT  TestScript/mod_list_bad_import
    script_test.go:141: 2026-05-27T10:39:28Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2906377531/tmpdir4247258502/mod_list_bad_import2335892201

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/mod_list_bad_import"

2026-05-26 15:12 gotip-darwin-arm64-race go@c73b7f56 cmd/go.TestScript/mod_list_bad_import [SKIP] (log)

=== RUN   TestScript/mod_list_bad_import
=== PAUSE TestScript/mod_list_bad_import
=== CONT  TestScript/mod_list_bad_import
    script_test.go:141: 2026-05-27T10:39:28Z
    script_test.go:143: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-2906377531/tmpdir4247258502/mod_list_bad_import2335892201

— watchflakes

[mrkfrmn]

cc @golang/command-line