Disable automatic insertion of "---@" on Enter

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### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Annotations, Completion, Formatting

### Expected Behaviour

When I hit Enter at the end of a class/parameter/etc. annotation, I get a new blank line.

### Actual Behaviour

When I type an annotation and hit Enter, I get `---@` automatically inserted.

### Reproduction steps

1. Type `---@class test`
2. Press Enter

### Additional Notes

I know this is an "intentional feature", but I would like a way to disable it. There is no setting that disables this (and only this) - turning "Editor: Auto Indent" to 'brackets' or lower disables this unwanted behavior, but then I lose auto-indent.

See https://github.com/LuaLS/lua-language-server/discussions/2786

### Log File

_No response_

Reproduce the behavior in the Visual Studio Code extension using the stated annotation steps, then trace the annotation, completion, and formatting handling along with existing configuration settings. Done means a setting can suppress automatic `---@` insertion on Enter while preserving normal auto-indentation.

Written by the indexing model from the issue text.