[lsp-server] [vscode-graphql] The language server should go into no-op mode when package.json is detected but doesn't contain graphql config

[acao]

Current Behavior (if applicable)

Currently, if package.json is present but no graphql config is present, the server will keep attempting to load the config on every change, and throwing a warning.
We want vscode-graphql to only load when graphql config is present, but package.json graphql config option as of 2.x or 3.x makes that difficult.

Desired Behavior

The LSP server should learn that graphql-config is not present for package.json and not try to load the config on every file change, and enter the no config present state where the server ignores events.

Perhaps we can even exit 0, so that the LSP server quits without the 5x attempted reloads, until an activation event triggers it again.