Remove media_entity_document because it is not used by Open Y. We migrated to core media

[podarok]

See https://github.com/ymcatwincities/openy/wiki/Important-versions-for-upgrade-path

media_ modules overview

There are following media_ modules in Open Y:

• media_directories - this is a module that provides Media Library browser thing, should be kept untouched;
• media_entity - legacy media_entity module, moved to Drupal Core, left in composer.json as a dependency for the Upgrade path from Open Y 1.x;
• media_entity_document - is not used by Open Y anymore, left in composer.json as a dependency for the Upgrade path from Open Y 1.x.
• media_entity_image - is not used by Open Y anymore, left here for the Upgrade path from Open Y 1.x;
• media_entity_video - this is a module in use. There are a couple of issues to resolve to get rid of the module: fix d9 compatibility, migrate to Drupal Core media - both addressed in this PR. The module can be marked as deprecated in the release note. Should be kept in composer.json for the Upgrade path from Open Y 1.x.

Original Issue, this PR is going to fix: remove not used module in Q2 2021

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 before this PR module is disabled
  

• Verify media_entity_document module not being pulled by composer.

General checks

• All coding styles are fulfilled and there are no any issues reported by CodeSniffer. See Code of Conduct.
• Documentation has been updated according to PR changes.
• Steps for review have been provided according to PR changes.
  
• Make sure you've provided all necessary hook_update_N to support upgrade path.
• Make sure your git email is associated with account on drupal.org, otherwise you won't get commits there.
  
• If you would like to get credits on drupal.org, check documentation.

Thank you for your contribution!

[gundevel]

Build comment file:

Check Open Y Installation Wizard at http://install.openy.cibox.tools/build2926/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/2926/

[gundevel]

Open Y Upgrade Path site check installed at http://upgrade.openy.cibox.tools/build2926/

[gundevel]

Open Y Complete profile installed at http://openy.cibox.tools/build2926/

[podarok]

[podarok]

for @duozersk

[gundevel]

Build comment file:

Check Open Y Installation Wizard at http://install.openy.cibox.tools/build3185/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/3185/

[gundevel]

Open Y Upgrade Path site check installed at http://upgrade.openy.cibox.tools/build3185/