.gitignore everything under .vs in repo root dir
.gitignore everything under .vs in repo root dir

We have external users editing queries with Visual Studio, and it seems
to automatically add very specific files to `.gitignore`. These changes
cause conflicts between unrelated PRs.

This commit adds all of `/.vs` to `.gitignore`, which should hopfully
make Visual Studio stop adding more entries.

github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql