[feature request] helm: Add support for gotemplate comments

[cornfeedhobo]

When working on helm templates, it would be amazing if the vscode's builtin comment toggle system was adjusted to support gotemplate comments, {{/* ... */}}.

[cornfeedhobo]

It looks like there is already an attempt to support this, but it's broken. I don't know why no one has raised this before...

changing language-configuration.json's comment section to only read

    "comments": {
        // comments applicable to tpl files.
        "blockComment": [ "{{- /*", "*/ }}" ]
    },

fixes all the problems with toggling lines and blocks