Remove "New Java File" submenu, etc. from Explorer context menu

[tsmaeder]

This extension contributes a submenu "New Java File" and other commands like "New Java Package, etc." to the explorer context menu. I don't think this is consistent with the VS Code UI style: you won't see "New Typescript File" when editing a typescript project, for example.
What's more, these menus clutter the context menu even in workspaces that are not Java-related at all.

• For creating new FIles, there is the file/newFilemenu (which is already contributed to)
• Creating a new package is just creating folders and there is already support for that (you can just type in foo/bar in order to create a hierarchy
• Creating a Java project is not context dependent and therefore should not be in a context menu: VS Code uses the command palette for this.
• The "Create Java Project" command is contributed to the file/newFile menu, which again, IMO, goes against VS Code custom.

[github-actions]

Hi @tsmaeder, I'm an AI Support assistant here to help with your issue. While the team reviews your request, I wanted to provide some possible tips and documentation that might help you in the meantime.

• This is a feature‐request/enhancement to allow hiding Java-specific context-menu items when not editing Java files.

High-confidence reference:

• Add option to disable right-click/context-menu elements
  Provides exactly this request: a configuration option to disable the “Maven (submenu)”, “New Java File”, “New Java Package…”, and “New Java Project…” items. Track and upvote/update this issue for progress or discuss possible configuration keys.
  Add option to disable right-click/context-menu elements redhat-developer/vscode-java#4141

Other references with low confidence

• Filter out run and debug contextual menu when the file doesn't contain a Main
  Another request to declutter the Explorer context menu by removing run/debug commands on non-runnable files. Not directly about “New Java File” but similar in spirit.
  Filter out run and debug contextual menu when the file doesn't contain a Main vscode-java-debug#937

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