## Description
Issues:
1. Excess padding on right side on MainContainer and other
container-like widgets.
2. End highlight not visible in deeply nested containers.
3. Modal widget takes up space on MainContainer.
Causes:
1.a. Border around the MainContainer has been removed. However, the
border width was still being deducted from the total width.
1.b. For parentColumnSpace calculation, CONTAINER_GRID_PADDING (= 6px)
was used. However, on AutoLayout canvases, containers only account for
5px in padding, resulting in excess space of 2px on the right side.
2.a. End position highlight has negative drop zones causing it to be
excluded from selection calculations.
2.b. container scrollbars are causing the drag on the canvas to not get
triggered.
3.a. This happens when the modal widget is dropped in an existing flex
layer. Check for `detachFromLayout` prop and move the widget to the
bottom of flexLayers.
Fixes # (issue)
1. https://github.com/appsmithorg/appsmith/issues/20705
2. https://github.com/appsmithorg/appsmith/issues/21311
3. https://github.com/appsmithorg/appsmith/issues/22423
4. https://github.com/appsmithorg/appsmith/issues/20111
5. https://github.com/appsmithorg/appsmith/issues/22655
Media
https://user-images.githubusercontent.com/5424788/232890004-2f66b697-e84c-4625-966d-894cc63f70b7.mov
## Type of change
- Bug fix (non-breaking change which fixes an issue)
## How Has This Been Tested?
- Manual
## Checklist:
### Dev activity
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] PR is being merged under a feature flag
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