Fix not working change of blocks ordering when the section has a heading block

Problem/Motivation

Change blocks ordering is not working when the section has a heading block

Steps to reproduce

- Install varbase.
- Create a new landing page node.
- Go to layout builder and add a new section and add a heading block with other blocks like(basic block, or HTML block).
- Save the page.
- Edit the layout builder for the same page trying to change the ordering of blocks, for example, make the heading block under the basic block by drag and drop will find an ajax error (No route found for \u0022POST \/node\/3\/1\/section_header).
- Save the page the new order is not applied.

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-9.0.11, varbase_layout_builder-10.0.23

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3317720 by Ahmad Abbad, Qusai Taha: Fixed not working change of blocks ordering when the section has a heading block