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

[alihamza1221]

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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]

A good change log entry explicitly states what problem you fixed, not how you fixed it. The original message essentially said, "Fixed _____ by writing code in a specific file". See https://6.docs.plone.org/contributing/index.html#change-log-entry after the Important admonition for details.

Suggested change

	Fixed Order blocks in sidebar doesn't respect layout restrictions by setting appropriate handlers in `Item.jsx`. @alihamza1221
	While editing a block, and in the sidebar under the {guilabel}`Settings` tab, when an item has {guilabel}`Required` checked, then it can no longer be deleted under the {guilabel}`Order`. Similarly, when {guilabel}`Fixed position` is checked, the item's ordered position can no longer be changed. Previously neither option was honored. @alihamza1221