Remove zlib unittests from unit_tests; they have their own test binary

These tests are in zlib_unittests, and that's already built and run by
the bots (after crrev.com/804566).

This removes the redundancy of building and running them twice, and
takes some load of the already very large unit_tests target.

While here, also move the zip and compression_utils to zlib_unittests
and try to clean up chrome/test/BUILD.gn from unnecessary zlib
references.

Bug: 352073
Change-Id: I3cfe020df9bc2699bbb160ae95b511840589e054
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534930


Commit-Queue: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826858}
GitOrigin-RevId: 49bce2f7a08bea183f39892a075be9ff92dc3c39