## Description
Limit the amount of nesting in the List widget to 3 levels.
The List widget could be nested in 2 ways.
1. Drag and Drop from Explorer
2. Copy and Paste.
3. Drag and Drop from Canvas
To cater to all these cases, I created 3 more blueprint operations that
serve as a life cycle for the widget.
1. BEFORE_ADD
2. BEFORE_PASTE
3. BEFORE_DROP
This would enable validation of the level/nesting before the DSL is
updated
Fixes#20585
## Type of change
- New feature (non-breaking change which adds functionality)
- This change requires a documentation update
## How Has This Been Tested?
- Cypress
### Test Plan
> [Nested List Widget Test
Plan](https://github.com/appsmithorg/TestSmith/issues/2187)
## Checklist:
### Dev activity
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] 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
### QA activity:
- [ ] Test plan has been approved by relevant developers
- [ ] Test plan has been peer reviewed by QA
- [ ] Cypress test cases have been added and approved by either SDET or
manual QA
- [ ] Organized project review call with relevant stakeholders after
Round 1/2 of QA
- [ ] Added Test Plan Approved label after reveiwing all Cypress test
---------
Co-authored-by: Ashit Rath <ashit@appsmith.com>
Co-authored-by: Favour Ohanekwu <fohanekwu@gmail.com>
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