4bc8015370
6013: Add support for custom flycheck commands with JSON project workspaces r=jonas-schievink a=woody77 Enable flychecks with JSON project workspaces if an override command was provided as part of the client configuration: ``` "rust-analyzer.checkOnSave.enable": true, "rust-analyzer.checkOnSave.overrideCommand": ["custom_tool", "arg1", "arg2"], ``` Co-authored-by: Aaron Wood <aaronwood@google.com>