refactor: Move should refresh logic to utils

lua/symbols-outline/utils/lsp_utils.lua

@@ -8,7 +8,16 @@ function M.is_buf_attached_to_lsp(bufnr)
 end
 
 function M.is_buf_markdown(bufnr)
-   return vim.api.nvim_buf_get_option(bufnr, 'ft') == 'markdown'
+    return vim.api.nvim_buf_get_option(bufnr, 'ft') == 'markdown'
+end
+
+---@param bufnr number
+---@return boolean
+function M.should_not_refresh(bufnr)
+    if (not M.is_buf_markdown(bufnr)) and (not M.is_buf_attached_to_lsp(bufnr)) then
+        return true
+    end
+    return false
 end
 
 return M