[jdk17u-dev] RFR: 8284389: Improve stability of GHA Pre-submit testing by caching cygwin installer

[Christoph Langer]

Hi all,

This pull request contains a clean backport of [JDK-8284389](https://bugs.openjdk.java.net/browse/JDK-8284389).

The commit being backported was authored by Christoph Langer on 7 Apr 2022 and was reviewed by Aleksey Shipilev.

Thanks!

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Commit messages:
 - Backport 61fcf2f67ff16bee92a5279e7bcacc79fc8f37ad

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/341/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=341&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284389
  Stats: 45 lines in 1 file changed: 39 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/341.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/341/head:pull/341

PR: https://git.openjdk.java.net/jdk17u-dev/pull/341