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Tercept Analytics Adapter: single request per auction, concurrent auction isolation & payload optimisation (#14679)

* tercept analytics: refactor to single request per auction

- Replace shared events object with per-auctionId Map to fix data loss
  when multiple auctions run concurrently
- Accumulate BID_WON, AD_RENDER_SUCCEEDED, AD_RENDER_FAILED and
  BIDDER_ERROR into the bids array; flush once 1.5s after AUCTION_END
- Use navigator.sendBeacon on visibilitychange so data survives page exit
- Add disableAnalytics to clear pending timers and maps on teardown
- Add try/catch around track() to prevent adapter errors disrupting page
- Remove ad, native and adUrl fields from bid payloads to reduce size
- Limit auctionInit.bidderRequests to first entry (device/site data
  is identical across all bidder requests)
- Add is_pl flag (true on first bid of first auction per page load)

* tercept analytics: rewrite test suite for refactored adapter

Replace tests that assumed multiple requests per auction and separate
top-level keys (bidWon, adRenderSucceeded, etc.) with tests matching
the new single-request-per-auction design. Covers:

- Request timing: no send before 1.5s timer, one request per auction
- Payload structure: top-level shape, bidderRequests trimmed to first,
  host/path/search attached at send time, ad/native/adUrl absent
- All event handlers: BID_REQUESTED, BID_RESPONSE, BID_TIMEOUT, NO_BID,
  BID_WON, AD_RENDER_SUCCEEDED, AD_RENDER_FAILED, BIDDER_ERROR
- is_pl flag: true on first bid of first auction only, reset on disable
- Concurrent auction isolation: separate bids and auctionInit per id
- visibilitychange flush via sendBeacon
- disableAnalytics: cancels timers, clears maps, resets firstSent
- Error resilience: unknown auctionIds and undefined args do not throw

* tercept analytics: fix linting, visibilitychange target, sendBeacon import

- Fix 81 indent errors by properly indenting the try block body
- Replace window.addEventListener with ... (continued)

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