fix:Order blocks in sidebar doesn't respect layout restrictions: requ…

[alihamza1221]

• I signed and returned the Plone Contributor Agreement, and received and accepted an invitation to join a team in the Plone GitHub organization.
• I verified there aren't other open pull requests for the same change.
• I followed the guidelines in Contributing to Volto.
• I succesfully ran code linting checks on my changes locally.
• I succesfully ran unit tests on my changes locally.
• I succesfully ran acceptance tests on my changes locally.
• If needed, I added new tests for my changes.
• If needed, I added documentation for my changes, either in the Storybook or narrative documentation.
• I included a change log entry in my commits.

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fixed : Order blocks in sidebar doesn't respect layout restrictions: required and fixed position

I added the checks to display the delete block and drag block button according to values set like fixed and required.
After my change:

order.block.fixes.video.mp4

Closes #6481

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[alihamza1221]

@plone/volto-team I have made the appropriate changes to fix the issue and It works as wanted please If you can review this PR.

[stevepiercy]

Please see my note about the change log entry.

Otherwise, this looks really good, but it should get a thorough technical review by the @plone/volto-team. Thank you!

[stevepiercy]

News looks good, still needs a technical review.

[fredvd]

@alihamza1221 We had the yearly Plone Conference Last week in Brasilia, BR, so most of our community members who are volunteers in this project were very busy with preparing, travelling and attending. It could therefore take a while before this is reviewed, but it will probably get on the next Volto Team meeting.

As @sneridagh loves the new sidebar ordering he'll want improvements for that added asap ;-) (teasing him)

[ichim-david]

instead of having a visibility style it would make more sense to me to have the "disabled" property added and this way you also get a screen reader compatible information on why you can't interact with the button

[alihamza1221]

Looks good, but there are other places were we have used visibilty style will update it today