Update SignInInterceptionBubble Pixel test names

This is done for the following benefits:

- Make it easier to understand the expected output when looking at
  screenshots in the SkiaGold UI, since only the output and the test
  name are available

- Allow reordering tests params without changing the name associated
  with a given output, since we rely on the params themselves instead
  of the index in the list of params. This will make it easier to
  modify the configs by inserting test variants while keeping
  similar configs grouped, instead of appending new ones to the end.

Bug: None
Change-Id: Iad898e4d52ce81a907fd1ab4cdaa103fef9fb6db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3494806
Auto-Submit: Nicolas Dossou-Gbété <dgn@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Jan Krčál <jkrcal@chromium.org>
Commit-Queue: Nicolas Dossou-Gbété <dgn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#976207}