feat(reporter): include config name in GitHub Actions summary header

[mixelburg]

Description

When name is set in the vitest config, append it to the job summary header so monorepo setups with multiple test suites can be distinguished at a glance.

Before:

## Vitest Test Report

After (when name: 'my-app' is set in config):

## Vitest Test Report (my-app)

Resolves #9992

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time.
• Ideally, include a test that fails without this PR but passes with it.
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Added a test in test/cli/test/reporters/github-actions.test.ts that verifies the config name appears in the summary header.

Documentation

No new API surface — name is an existing config field.

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