Use implementation jar for updatable-media in snapshot for S

While enabling prebuilts in T we hit b/229932396 which was caused by
some parts of the build depending on the prebuilt updatable-media jar
which used to be a full implementation jar but which is now an invalid
jar as the snapshot must not be including implementation details. We
fixed the issue in T but we are hitting the same problem in S with the
M-2022-07.

That is the first train in which the prebuilt updatable-media module
provides an invalid jar, prior to that it was always providing an
implementation jar. This change tweaks the sdk snapshot generation
code to use an implementation jar for updatable-media in the S
snapshot to avoid partners having to cherry pick changes similar to
those needed to fix b/229932396 in T.

Bug: 239121291
Test: packages/modules/common/build/mainline_modules_sdks.sh
      # Check that S media snapshot includes implementation jar.
      # Check that S art snapshot includes invalid jar.
      # Check that T media snapshot includes invalid jar.
Change-Id: Ib49484d00a60b4ed7f8268e04f9c10a3498edb56