fix(Select): Selecting an option triggers a touch event on elements positioned behind

[maebug]

Description

Fixes #1658.

Uses event.composedPath().includes(content) instead of content.contains(event.target) during the pointerup event handling. This solves an issue where the browser retargets event.target to the shadow host element for document-level listeners. composedPath() will pierce the shadow boundary for shadow roots with the open mode.

A test has been added to prove this fix works. This test would fail with the old content.contains() approach, but passes with the changes in this PR.

Huge shoutout to @spencermarx who pointed out the solution in a comment on the associated issue. Thank you!

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