feat(runner): test context can inject values from the config's provide

[sheremet-va]

Description

Continuation of #6253
Related to #6226

This PR allows defining a context value that can be overridden by the project config:

// vitest.workspace.ts
export default defineWorkspace([
  {
    test: {
      environment: 'jsdom',
      provide: {
        myValue: 'injected',
      },
    },
  },
  {
    test: {
      environment: 'node',
    },
  },
])

const test = baseTest.extend({
  myValue: ['default', { injected: true }]
})

test('some test', ({ myValue }) => {
  // for the jsdom environment
  expect(myValue).toBe('injected')
  // for the node environment
  expect(myValue).toBe('default')
})

TODO

• Docs (add for passing down values between the config and tests + context's injected)

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. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• 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

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

[netlify]

✅ Deploy Preview for vitest-dev ready!

Name	Link
🔨 Latest commit	ea26860
🔍 Latest deploy log	https://app.netlify.com/sites/vitest-dev/deploys/6734ce8016ba27000845622c
😎 Deploy Preview	https://deploy-preview-6813--vitest-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.