fix: json reporter detects skip mode correctly (#930)

Author: stygian-desolator

packages/vitest/src/node/reporters/json.ts

@@ -56,7 +56,7 @@ export class JsonReporter implements Reporter {
     const testResults: Array<TestResult> = tests.map(t => ({
       displayName: t.name,
       failureMessage: t.result?.error?.message,
-      skipped: t.result?.state === 'skip',
+      skipped: t.mode === 'skip',
       status: t.result?.state,
       testFilePath: t.file?.filepath,
     }))

test/reporters/tests/__snapshots__/reporters.spec.ts.snap

@@ -59,7 +59,7 @@ exports[`json reporter 1`] = `
     },
     {
       \\"displayName\\": \\"async with timeout\\",
-      \\"skipped\\": false,
+      \\"skipped\\": true,
       \\"testFilePath\\": \\"/vitest/test/core/test/basic.test.ts\\"
     },
     {