internal/task: increase tagx test verbosity
internal/task: increase tagx test verbosity

I have no earthly idea why this script seems to be hanging for 10
seconds. Add more logging.

For golang/go#56231.

Change-Id: I473ae4856c58191c25c70d899520eed0f78738f2
Reviewed-on: https://go-review.googlesource.com/c/build/+/444118
Auto-Submit: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Run-TryBot: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>

golang/build,golang/build,golang/build,golang/build