RFR: 8306658: GHA: MSVC installation could be optional since it might already be pre-installed [v2]

[Christoph Langer]

> We figured that seemingly the correct toolchain could (and is) already installed by default and it makes sense to skip the expensive installation operation which takes some 10+ minutes in that case.
> 
> I also tested the scenario with an older toolchain version which would need installing, e.g. 14.28.

Christoph Langer has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  JDK-8306658
  
  GHA: MSVC installation could be optional since it might already be pre-installed

-------------

Changes: https://git.openjdk.org/jdk/pull/13574/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13574&range=01
  Stats: 14 lines in 1 file changed: 14 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13574.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13574/head:pull/13574

PR: https://git.openjdk.org/jdk/pull/13574