Web sequences don't seem to be supported

Web sequences seemingly always return:

```json
{"error":"The requested resource does not exist."}
```

This is because in the plugin today, for web actions we only invoke if there is no sequence found. See https://github.com/adobe/aio-cli-plugin-app-dev/blob/main/src/lib/run-dev.js#L525

I am not sure if this is a bug or an intentional thing, but documenting this issue so its known

Start by reading src/lib/run-dev.js around line 525 and reproduce the reported response for a web sequence. Determine whether the current condition is intentional or a bug, then verify that the expected web-sequence behavior is established and the reported "requested resource does not exist" result is addressed or documented.

Written by the indexing model from the issue text.