Overzealous `getUncles` `KvtNotFound(Kvt, ctx=get, error=GetNotFound)` warning on `GetBlockBodies` request
This isn't anything going wrong, and should not be a warning.

from https://github.com/status-im/infra-nimbus/issues/193#issuecomment-2354982492
```
WRN 2024-09-17 09:05:17.889+00:00 getUncles()                                topics="core_db" ommersHash=3EF3400295E8F4DFE6AED323009018E85DADBB1A4D960FC5CEE0709D484F6E97 error="KvtNotFound(Kvt, ctx=get, error=GetNotFound)"
```
with many more like this in the logs, even before any CLs had started to use the `nimbus-eth1` engine API, i.e. it was only based on connected eth68 peers. Based on this, the most likely reason is that the not completely synced `nimbus-eth1` node
https://github.com/status-im/nimbus-eth1/blob/ea74e035ab019619fc00b46ab97496b502a188dd/nimbus/sync/protocol/eth68.nim#L210-L231
calling
https://github.com/status-im/nimbus-eth1/blob/ea74e035ab019619fc00b46ab97496b502a188dd/nimbus/sync/handlers/eth.nim#L354-L367
calls (eventually)
https://github.com/status-im/nimbus-eth1/blob/ea74e035ab019619fc00b46ab97496b502a188dd/nimbus/db/core_db/core_apps.nim#L649-L662
calls
https://github.com/status-im/nimbus-eth1/blob/ea74e035ab019619fc00b46ab97496b502a188dd/nimbus/db/core_db/core_apps.nim#L596-L609
when the header is present but not the body is not.

For example, this can occur after having imported era1 files -- `persistBlocks` etc do populate the headers in the database, but not (because the blocks already live in the era1 files) the blocks themselves. And they are pre-merge, so they have non-empty uncles/ommers.