[BUG] Enabling plugins.lsp.rust-analyzer and rustaceanvim spawns 2 LSPs about nixvim

[alisonjenkins]

Well the upstream plugin mentions:

Warning
Do not call the nvim-lspconfig.rust_analyzer setup or set up the lsp client for rust-analyzer manually, as doing so may cause conflicts.

We should probably add some validation against us having lsp.servers.rust-analyzer enabled while using rustaceanvim then if that is the case to prevent misconfigurations and future bug reports.

The configuration being ignored though is definitely a problem though which I haven't yet got to the bottom of but still testing to figure out how that is supposed to work.

[traxys]

Well the upstream plugin mentions:

Warning

Do not call the nvim-lspconfig.rust_analyzer setup or set up the lsp client for rust-analyzer manually, as doing so may cause conflicts.