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Move some private methods of Xcode(11)LogParser to public, and call
these at tear down of test_runner module for GTests running as XCTests.

To avoid duplicate logic where touched, this change also:
- Added using_xcode_11_or_higher() to xcode_util module.
- Added get_parser() to xcode_log_parser module.
- Renamed coverage_util to file_util and added in an archiving utility.

Bug: 1047704
Change-Id: Id66ebd7a4ca1b2f7ea494eda66c015240f581c13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2496345
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823380}