boot: fix unclosed traceBegin of derivePackageAbi

- PackageAbiHelper#derivePackageAbi's exception skipped its Trace#traceEnd. Therefore, wrap it with try block and call traceEnd() at `finally`.

Test: perfetto traces shouldn't show infinitely long startServices event
BUG: 284054349
Change-Id: Ia9f5f136e92e75ac6bbe2dde7918787744f84ab5