`:LspRestart` and `:LspStop` show completion for invalid language servers

[brianhuster]

Description

For Nvim 0.11.2 and later, :LspRestart and :LspStop require the server name to be available in vim.lsp.config table (which means it must be configured in new 0.11 way). However the completion both commands provide also include servers that were started with vim.lsp.start() or vim.lsp.start_client(). And if I provide no server names to :LspRestart/:LspStop, both commands will also attempt to stop those invalid servers, which leads to error.

To reproduce, just install this plugin and copilot.vim. After that, try running :LspRestart (with no arguments)

[brianhuster]

Probably off-topic, but @mfussenegger suggested that :LspRestart and :LspStop commands should also support clients not configured via lsp-config (not available in vim.lsp.config table). What do you think?
neovim/neovim#35078 (comment), neovim/neovim#35078 (comment)

[superatomic]

Fixed in neovim/neovim#36925. It might be worth backporting these fixes into this repo for nvim 0.11.