[FLEDGE] Add some basic component auction WPT tests.

In particular, test:

* allowComponentAuction
* Top-level auctions can't have buyers.
* Auction worklet origin parameters.
* Bid passing/modification.

Bug: 1425952
Change-Id: Iccc59be915332ab38f85fd84e5ce9f290ece184e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5008033
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1220413}