[jdk8u-dev] RFR: 8309143: [8u] fix archiving inconsistencies in GHA

[Zdenek Zambersky]

There are few inconsistencies when it comes to packing/unpacking of JDK in GHA. Tar archives are not gzipped despite use `.tar.gz` extension. Zip JDK archives on windows are being extracted by tar. These inconsistencies do not cause failures, but better to fix them. Affects JDK 8 only.

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Commit messages:
 - GHA archive format fixes

Changes: https://git.openjdk.org/jdk8u-dev/pull/327/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=327&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309143
  Stats: 14 lines in 1 file changed: 0 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/327.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/327/head:pull/327

PR: https://git.openjdk.org/jdk8u-dev/pull/327