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Moves bookmarks_egtest helpers into a new file BookmarkEarlgreyUtils.

Change-Id: Ib03473684b160090428960d6b6b2437d4b748c9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956226
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723541}