[jdk11u-dev] RFR: 8306658: GHA: MSVC installation could be optional since it might already be pre-installed

[Christoph Langer]

This is a backport of JDK-8306658. I had to resolve because in jdk11u-dev there is no GTest download.

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Commit messages:
 - Backport d980cb48793f2bb662aece545fb00724c12a5613

Changes: https://git.openjdk.org/jdk11u-dev/pull/1850/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1850&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306658
  Stats: 14 lines in 1 file changed: 14 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1850.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1850/head:pull/1850

PR: https://git.openjdk.org/jdk11u-dev/pull/1850