Reporter error is silenced when `--merge-reports`

[hi-ogawa]

Describe the bug

I noticed this in #9641 when I try to merge blob reporter into html reporter but html reporter was broken. There's an intentional .catch(noop), but I'm not sure this is desired behavior. Perhaps, at least, it should log what's thrown? also adjust exit code?

vitest/packages/vitest/src/node/core.ts

Line 610 in 17798da

await this._testRun.start(specifications).catch(noop)

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-nmeth2lr?file=vite.config.ts

// vite.config.ts
import { defineConfig } from 'vite';

export default defineConfig({
  test: {
    reporters: [
      {
        onTestRunStart() {
          if (process.env.CRASH_REPORTER) {
            console.log('throwing but nothing?');
            throw new Error('boom');
          }
        },
      },
    ],
  },
});

❯ vitest --run --reporter=blob
blob report written to /home/projects/vitest-dev-vitest-nmeth2lr/.vitest-reports/blob.json

# exit code is 0
❯ CRASH_REPORTER=1 vitest --run --merge-reports 
throwing but nothing?

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @vitest/ui: latest => 4.0.18 
    vite: latest => 7.3.1 
    vitest: latest => 4.0.18

Used Package Manager

npm

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