Jenkins truncates logs excessively for failing tests.

[damccorm]

More background info in https://issues.apache.org/jira/browse/BEAM-9976?focusedCommentId=17134617&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17134617

The code for the jenkins junit plugin indicates stdout/stderr logs should be truncated to 1MiB for failing runs, and just 1 KiB for passing runs. However all Beam tests seem to be truncated to 1 KiB, not just passing runs. This can make it very difficult to debug flaky tests, since they are challenging to reproduce locally, and nearly all the relevant information from the failures is removed.

Imported from Jira BEAM-10262. Original Jira may contain additional context.
Reported by: bhulette.