[jdk8u-dev] RFR: 8244966: Add .vscode to .hgignore and .gitignore

[SendaoYan]

Hi all,

This pull request contains a backport of commit [95c0b97b](https://github.com/openjdk/jdk11u-dev/commit/95c0b97bc2bfcb686dfabc6d74424772f0f866a1) from the [openjdk/jdk11u-dev](https://git.openjdk.org/jdk11u-dev) repository.

The commit being backported was authored by SendaoYan on 30 Jul 2024 and was reviewed by Paul Hohensee.

Trivial fix but useful, no risk.

Thanks!

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

Commit messages:
 - Backport 95c0b97bc2bfcb686dfabc6d74424772f0f866a1

Changes: https://git.openjdk.org/jdk8u-dev/pull/556/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=556&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8244966
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/556.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/556/head:pull/556

PR: https://git.openjdk.org/jdk8u-dev/pull/556