fix: Comments on unchanged, expanded lines (#146)

This MR fixes an issue with refreshes of the diagnostics and signs when users leave comments on unchanged lines.

lua/gitlab/actions/discussions/annotations.lua

@@ -71,3 +71,19 @@
 ---@field resolved_discussions number
 ---@field resolvable_notes number
 ---@field resolved_notes number
+---
+---@class SignTable
+---@field name string
+---@field group string
+---@field priority number
+---@field id number
+---@field lnum number
+---@field buffer number?
+---
+---@class DiagnosticTable
+---@field message string
+---@field col number
+---@field severity number
+---@field user_data table
+---@field source string
+---@field code string?