Support Concurrent Cypress E2E Tasks with Auto Port Detection in Nx

[RichardLindhout]

Current Behavior

Running multiple Cypress E2E tasks in Nx (e.g., nx run-many -t e2e) fails due to port collisions on the hardcoded baseUrl (e.g., http://localhost:4200).

Expected Behavior

Multiple Cypress tasks should run concurrently without port conflicts.

What have we tried

We already have dynamic ports per app but we can't run E2E on different PR's and commits simultaneously.

Proposed Solution

Add an 'auto' port option to @nx/cypress’s nxE2EPreset. Nx would:

1. Start the web server with an available port (like @nx/web’s auto mode).
2. Read the assigned port and dynamically set the baseUrl for Cypress tasks. E.g. 'auto' baseUrl.

Related issue: #22109
cc: FrozenPandaz (because you proposed something similar)