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

---

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

[poltorak]

@BioPhoton PR1 and PR1.2 are covered and at the moment awaiting for your approval.

I'm happy to do next step which is PR2 but I'd need more context what is the actual goal of that