auto_delete_nightly_test_data: enhance telemetry file deletion

The output of this function was unhelpful. Much like previous CLs
changing this file, this CL seeks to make the output more helpful (and
make the removal more resilient to transient errors).

Functionally, this also means we'll wait a day before removing these
subdirectories. This doesn't seem inherently bad.

BUG=b:230656849
TEST=Ran on Chrotomation

Change-Id: I8e5f9bdd7725591abb5a694eebd1b47f8a3f6eb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/3614355
Reviewed-by: Jordan Abrahams-Whitehead <ajordanr@google.com>
Tested-by: George Burgess <gbiv@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
1 file changed