Find logs in local cuttlefish directories

This commit rewrites cvd_utils.FindLocalLogs. The function finds log
files by name extension. It can report the newly added logs in the
current version.

Test: acloud-dev create --local-image --local-instance -vv \
      --report-file ./report.json
Bug: 265743185
Change-Id: I1c2b5aa4ab48a192c419aa12ad17bd9ea5016a5d
2 files changed