Rename decisionLogicUrl to decisionLogicURL

This is to match standard naming conventions in the web platform.
Follow-up CLs will rename other *Url members of interest group and ad
auction configs.

Both naming conventions will need to be supported for a time, to allow
sites to transition. To further aid transitioning, for a given
dictionary field, if both the fooUrl and fooURL versions are provided,
no error will be issued if both versions have the same value.

These are the sites that need to support the old and new names -- they
each have tests to ensure that both new and old names work:

1. runAdAuction() (in Blink)

2. Auction configs passed to the seller worklet

Bug: 1432707
Change-Id: Iab8cc61ad1271d901d32df2e1aa9bfc5bec56739
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4538103


Reviewed-by: Russ Hamilton <behamilton@google.com>
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1146591}