Add timeout log count to BugReportDurationHelper

This change adds timeout log count as a metric emitted by
BugReportDurationHelper. This is intended to be used for alerting when
the number of timed out dumpstate sections increases.

Test: Run a test with this change and verify that the new metric exists.
      Also test that this is non-zero if a section times out.
Bug: 299540205
Change-Id: I9c5fd2def5410aae87263c8ab3927c0ae0190562
1 file changed