fix failed tests from MessageProcessor.spec.ts on MacOS

[dimaMachina]

I had always failed tests on my machine

after investigation, I found that genSchemaPath doesn't include os.tempdir() but on CI it pass

graphiql/packages/graphql-language-service-server/src/__tests__/MessageProcessor.spec.ts

Lines 67 to 68 in 7404e8e

	const genSchemaPath =
	'/tmp/graphql-language-service/test/projects/default/generated-schema.graphql';

сс @acao

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