Update Unit Test Runner Option

Update vitest unit test runner option to vitest-analog in generator defaults

Updates the unitTestRunner generator default from vitest to vitest-analog in nx.json. The vitest option has been split into two explicit options: vitest-angular (uses @angular/build:unit-test) and vitest-analog (uses AnalogJS-based setup).

Examples

The migration updates generator defaults in nx.json:

Before

// nx.json
{
  "generators": {
    "@nx/angular:application": {
      "unitTestRunner": "vitest",
    },
  },
}

After

// nx.json
{
  "generators": {
    "@nx/angular:application": {
      "unitTestRunner": "vitest-analog",
    },
  },
}