[blocking] Renamed spawn eggs do not produce renamed mobs (by hand or dispenser)

Verification builds: Release 891562
Summary: MCPE-18055: Renamed spawn eggs do not apply their name to the resulting mob (including mobs from dispensers)

Impact: Can't produce arbitrary named mobs during map runtime (names builtin to /summon would be more agreeable, but that's obviously a feature request.)

Repro Steps:
1. Get a spawn egg
2. Get an anvil
3. Rename the spawn egg to "test"
4. Use it on the ground
5. Get a dispenser and redstone power
6. Place the spawn egg in the dispenser and power it
7. Run /say @e[name=test]

Observed Results: No output – neither mob received the name.

Expected Results: Names of both mobs are "test" and are printed to chat.

Screenshots/Videos attached: No