fix: Collapsed state was incorrectly calculated in some cases.

[istarkov]

Description

ref #3994

2 bugs:

1. Wrong calculation of

Box
  Box display=contents
     Box

Example before this PR

https://p-882ed593-40cc-4382-b119-15c588d0ce6f-dot-main.development.webstudio.is/

Example After this PR
https://p-882ed593-40cc-4382-b119-15c588d0ce6f-dot-fix-collapse.development.webstudio.is/

2. It was possible that Content Block was like

Box contents
  Box contents

what caused inability to find it position, outline and collapse attributes

Steps for reproduction

1. click button
2. expect xyz

Code Review

• hi @kof, I need you to do
  • conceptual review (architecture, feature-correctness)
  • detailed review (read every line)
  • test it on preview

Before requesting a review

• made a self-review
• added inline comments where things may be not obvious (the "why", not "what")

Before merging

• tested locally and on preview environment (preview dev login: 0000)
• updated test cases document
• added tests
• if any new env variables are added, added them to .env file