feat(github-actions): include project name in job summary heading

[Copilot]

In monorepos where multiple vitest configs run in the same CI job, all summaries are written to the same $GITHUB_STEP_SUMMARY file and produce identical ## Vitest Test Report headings — making it impossible to tell them apart at a glance.

Changes

• renderSummary – accepts an optional name parameter; when set, heading becomes ## Vitest Test Report (name) instead of the static fallback
• onTestRunEnd – passes this.ctx.config.name to renderSummary automatically; no reporter option change needed

Usage

Set name in your vitest config:

// apps/web/vitest.config.ts
export default defineConfig({
  test: {
    name: 'web',
    reporters: ['github-actions'],
  },
})

Each suite's summary will now be headed ## Vitest Test Report (web), ## Vitest Test Report (api), etc., making the job summary scannable in a monorepo context.

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