Add test for error message regarding validation problem on _quarto.yml

tests/docs/yaml/bad-config-yaml/.gitignore

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+/.quarto/

tests/docs/yaml/bad-config-yaml/_quarto.yml

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+project:
+  title: "bad-config-yaml"
+  type: 1

tests/docs/yaml/bad-config-yaml/subfolder/bad-config-yaml.qmd

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+---
+title: "bad-config-yaml"
+---
+
+## Quarto
+
+This is a doc in a dummy project to check that error message is correct

tests/smoke/yaml/config-yaml-validation.test.ts

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+/*
+* config-yaml-validation.test.ts
+*
+* Copyright (C) 2024 Posit Software, PBC
+*
+*/
+
+import { testQuartoCmd } from "../../test.ts";
+import { docs } from "../../utils.ts";
+import { printsMessage } from "../../verify.ts";
+
+const input = docs("yaml/bad-config-yaml/subfolder/bad-config-yaml.qmd");
+
+testQuartoCmd(
+  "render",
+  [input],
+  [printsMessage("ERROR", /bad-config-yaml[\/\\]+_quarto[.]yml validation failed/)]
+);