Fix University of Twente scraper (0 events ingested)

[ioan-alexandra]

Summary

• By inspecting the site's JS bundle, found the actual WebHare JSON-RPC endpoint the page itself calls to load events: POST /wh_services/utwente_base/rpc/GetNEOItems, paginated via a skip parameter.
• Rewrote UtwenteIngestor to call this endpoint directly, with proper pagination (capped at MAX_PAGES as a safety net) instead of a single hardcoded request assuming one page.

Verification

• Called the discovered endpoint directly against the live site - confirmed it returns real, current UT events with pagination (moreitems/skip).
• Rewrote the VCR cassette and test to cover a 2-page pagination scenario.

Motivation and context

UT rebuilt their events page as a fully client-rendered app at a new URL (/en/about-us/news-events-ceremonies/events/, redirected from the old /en/events/).

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.