[selection api] Rewrite Selection-getComposedRanges-range-update.html

This change reformat the tentative test
Selection-getComposedRanges-range-update.html to match the spec
at https://github.com/whatwg/dom/pull/1342:
1. If selection is across different roots, getRangeAt(0) should throw
   INDEX_SIZE_ERR.
2. If a live range sets its end/start to a disconnected node, the live
   range and the selection are both collapsed.
3. If a live range sets its end/start to cross a shadow boundary such
   that the range has start before end, collapse the live range,
   but not the composed selection range.
4. If a live range sets its end/start to cross a shadow boundary such
   that the range has start after end, collapse both the live range
   and the composed selection range.

We also clean up the other range API tests: selectNode(), collapse,
createRange(), addRange().

Change-Id: I03f9309be67b21a781c47d555732a3480322097b
Bug: 40286116
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6383722
Reviewed-by: Dominic Farolino <dom@chromium.org>
Commit-Queue: Di Zhang <dizhangg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1437019}