Add LeafNode to forbid adding Node children to certain Nodes
#58898
| Job | Run time |
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| 15m 28s | |
| 12m 23s | |
| 7m 58s | |
| 5m 25s | |
| 8m 46s | |
| 12m 42s | |
| 2m 7s | |
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| 34s | |
| 27s | |
| 1m 3s | |
| 8m 49s | |
| 2m 19s | |
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| 1m 47s | |
| 1m 29s | |
| 1h 23m 22s |