cmd/test2json: attribute output to the correct test
When printing regular test output check the indentation of the output, and use
the report stack to find the appropriate test name for that output.
This change includes a whitespace change to some golden test files. The
indentation of tests was changed in CL 113177
from tabs to spaces. The golden files have been updated to match the new
output format. The tabs in the golden files cause problems because the indentation check
looks for 4 spaces.
Fixes #29755
Updates #25369
Change-Id: Iebab51816a9755168083a7a665b41497e9dfd85f
GitHub-Last-Rev:
898827f1a6a163fd81dc667f5d27fd4893260038
GitHub-Pull-Request: golang/go#34419
Reviewed-on: https://go-review.googlesource.com/c/go/+/196617
Reviewed-by: Bryan C. Mills <bcmills@google.com>