test: introduce `test-vitest-setup` project to handle test setup for vite tests

[BioPhoton]

Introduce test-vitest-setup project to handle test setup for vite tests

---

PR1

• Introduce project test-vitest-setup under the testing folder and add configuration. Copy the example linked below and add potential improvements.
  • adjust coverage.reportDirectory to be at project root (packages/<name>/.coverage)
  • add unit tests
  • use existing types see this comment
  • add minimal docs to the test-vitest-setup project on how to use

Example implementation:

• test-vitest-setup source
• test-vitest-setup usage

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PR1.2

• Extend vitest.{targetName}.config.ts from test-vitest-setup configuration. (consider the changed reportDirectory may be a breaking change for the CI pipeline)
  • unit tests
  • int tests
  • e2e tests

---

PR2

• improve test coverage config, exclude index.ts
• remove vitest executor defaults from nx.json

"@nx/vite:test": {
      "cache": true,
      "inputs": ["default", "test-vitest-inputs"],
      "options": {
        "passWithNoTests": true,
        "watch": false
      }
    },

• Rename nx-plugin/mock to models/mocks
• Rename examples/plugins/src/lighthouse/mockto examples/plugins/src/lighthouse/mocks
• After all folders are renamed to mocks adjust inputs in nx.json
• Move zod2md.ts under {projectRoot}/tools and make sure "!{projectRoot}/tools/**/*" is added under nx.json#namedInputs.production