Do not show flex properties in style panel when layout is not flex

[istarkov]

Description

1. What is this PR about (link the issue and add a short description)

Do not show flex properties in the style panel when a layout is not flex
closes #687

Here I patched appliesTo of properties alignItems, justifyItems see mdn/data#585

Steps for reproduction

Opens designer panel, check no flex props in display: block layout

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: 5de6)
• updated test cases document
• added tests
• if any new env variables are added, added them to .env.example and the designer/env-check.js if mandatory

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Name	Status	Preview	Updated
webstudio-designer	✅ Ready (Inspect)	Visit Preview	Jan 2, 2023 at 10:02AM (UTC)