After PR #43676 '[4.4] Move the Cypress Tests to ESM' the Cypress config file is renamed to cypress.config.mjs. This PR is for updating README, architecture pictures and the Cypress run option in package.json.

Summary of Changes

1. Update file names cypress.config.mjs and cypress.config.dist.mjs in README and architecture pictures.
2. Update README with Cypress defineConfig() syntax for new ESM
3. Explicit name --config-file cypress.config.mjs in package.json to have the new file name in error messages. As this does not work for npx cypress, all given commands are changed to use npm run cypress in README.

Testing Instructions

• Check all usage of cypress.config.js and cypress.config.dist.js are updated.
• Check all npx commands are replaces by correct npm run
• Check all changes, something missing?

Actual result BEFORE applying this Pull Request

• tests/System/README.md and the used architecture pictures are documenting cypress.config.js and cypress.config.dist.js
• npx for running Cypress in the code samples

Expected result AFTER applying this Pull Request

• tests/System/README.md and the used architecture pictures are documenting cypress.config.mjs and cypress.config.dist.mjs
• npm run for running Cypress in the code samples

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

Note

There are other places with cypress.config.js and cypress.config.dist.js in the source code, which will be covered in a follow-up PR.