Add `eslint-plugin-playwright` / `eslint-plugin-vitest` if eslint and playwright/vitest selected

[seanlail]

Describe the problem

When running npm create svelte@latest we are given the option to add eslint / unit tests or integration tests.

When we add eslint, vitest and playwright however, we end up with a partial configuration setup.

We should be adding the plugins for linting the above testing frameworks and configuring them correctly.

Describe the proposed solution

• eslint-plugin-playwright should be added to the eslintrc and package.json if we select playwright.
• eslint-plugin-vitest should be added to the eslintrc and package.json if we select vitest.

Update the eslint config to add these eslint plugins and correctly configure them.

Example:

• vitest files are in /src and they should be linted with the correct plugin, not the playwright plugin
• playwright files are in /test and they should be linted with the correct plugin, not the vitest plugin

Alternatives considered

No response

Importance

nice to have

Additional Information

No response

[seanlail]

Example repo with how I think it should be setup: https://github.com/seanlail/kit-issue-10437

Side note: Should testing-library be added? There are no component tests in the example.