Build the proguard dict zip without PACKAGING intermediates

Before, as each module was built, it would dump its proguard-related
files into the PACKAGING folder. Then the rule for the final distable
zip would zip up this whole folder. This means that if you built a
module that was not part of the system, and then rebuilt the final
zip, it would erronously include more proguard files than necessary.
This problem was worked around by relying on CI to run `m installclean`
every time.

Now, the zip proguard files always include the same information.

This also makes it so that when you build a module, its proguard files
are not copied to the PACKAGING folder, making builds that don't
build the final proguard zips slightly faster.

Bug: 205632228
Test: diff'd proguard-dict.zip, proguard-dict-mapping.textproto, and proguard-usage.zip before/after this cl on sdk_phone_x86_64. They have diffs, but only in the order of files / lines.

Change-Id: I98c02e1eb117c337ba9b98f04ad486597eb9bb86