### What problem does this PR solve?
Feat: The Begin and IterationStart operators cannot be deleted using
shortcut keys #4287
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Limit the iteration start node to only be the source node #4242
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Add the iteration Node #4242
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: Translation test run form #3355
feat: Wrap QueryTable with Collapse #3355
feat: If the required fields are not filled in, the submit button will
be grayed out. #3355
feat: Add RunDrawer #3355
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: Add DynamicInputVariable to RetrievalForm #1739
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
