Replace extract_srcjars.sh with zipsync

Use zipsync instead of extract_srcjars.sh.

Also fixes an issue where unzipping a resource zip would
ignore anything that wasn't a *.java file.

Bug: 73885582
Test: m checkbuild
Change-Id: I1c25f65afa196614879071c8655866febebac185
Merged-In: I1c25f65afa196614879071c8655866febebac185
(cherry picked from commit 3f99cd59)