pw_build: Don't capture the output of HIL tests
pw_build: Don't capture the output of HIL tests

"Captured" output is in fact simply thrown away, but we do want these
logs to be saved for tests.

Bug: b/203133921
Change-Id: I087c00e3dd648faa00a6a41324834c133a231ca7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/77301
Reviewed-by: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>
Commit-Queue: Ted Pudlik <c7372cc3e451acc046049fca9e050bcb2a4a3d11@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed