Add vale plugin to recommended VS Code extensions

What does this MR do?

Adds the vale extension to the list of recommended VS Code extensions.

Why was this MR needed?

So that VS Code picks up our vale linting rules:

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Added tests for this feature/bug
• In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

#25593 (closed)