feat(decouple): Check openy_demo_content

[podarok]

To check if it is correctly decoupled

Original Issue, this PR is going to fix: https://openy.atlassian.net/browse/MAINTAIN-3

Make sure these boxes are checked before asking for review of your pull request - thank you!

If there is a new feature or this is a bug fix - use 9.x-2.x branch. We'll tag for release if the bug is critical asap or tag for release next bug fix release until critical issue arrived.

Steps for review

• Check feat(decouple)!: Decouple openy_demo_content open-y-subprojects/openy_features#3
• Check demo content modules are in place after composer
  

General checks

• All coding styles are fulfilled and there are no any issues reported by CodeSniffer. See Code of Conduct.
• Try to use Conventional commit messages accordingly to the standard https://www.conventionalcommits.org/en/v1.0.0/#specification
• Documentation has been updated according to PR changes.
• Steps for review have been provided according to PR changes.
  
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Thank you for your contribution!

[gundevel]

Build comment file:

Check Open Y Installation Wizard at http://install.openy.cibox.tools/build3256/install.php

---

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
http://openy.cibox.tools:8080/job/PR_BUILDER_COMPOSER/3256/

[gundevel]

Open Y Upgrade Path site check installed at http://upgrade.openy.cibox.tools/build3256/

[podarok]

seems works

[gundevel]

Build comment file:

Check Open Y Installation Wizard at http://install.openy.cibox.tools/build3257/install.php

---

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
http://openy.cibox.tools:8080/job/PR_BUILDER_COMPOSER/3257/

[gundevel]

Open Y Upgrade Path site check installed at http://upgrade.openy.cibox.tools/build3257/