fix(theme-common): fix missing code block MagicComments style in Visual Basic (.NET) 16

[tats-u]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

The following code in VB.NET and VB.NET code in Dogfooding test cases is not valid due to the magick comment:

Dim array = {
  1,
  2,
  ' highlight-next-line
  3 ' Don't add the trailing comma here!
}

We have to use _ ' there instead but it has not been supported in Docusaurus yet.

Dim array = {
  1,
  2,
  _ ' highlight-next-line
  3 ' Don't add the trailing comma here!
}

This _ ' is supported only in Visual Studio 2019 or later (VB 16.x). There is no way to add comments in the middle of statements in older VB including Excel VBA.

I believe that this can be safely merged in v3.1.1. (minor language & does not break existing code blocks)

Also, VB.NET code in Dogfooding test has the wrong name for set. Set is wrong and must be HashSet instead.

Test Plan

Dogfooding

Test links

Deploy preview: https://deploy-preview-9727--docusaurus-2.netlify.app/tests/pages/code-block-tests#magic-comments-tests

Related issues/PRs

#9671

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[github-actions]

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[slorber]

Thanks

Let's consider it as a follow-up fix of #9671

[tats-u]

Thank you for approving the merge into 3.1.1.