[MCPE-236159] /ride produces multiple lines of command output in one case

The bug

Most commands are supposed to produce exactly one success message or one failure message upon completion. However, the /ride command can produce multiple messages when selecting multiple entities, and some were affected but others weren’t.

Result	Expected output	Actual output
No targets started riding	One error message	✅ One error message
Some targets started riding, some didn’t	One success message	❌ One success and one error message
All targets started riding	One success message	✅ One success message

How to reproduce

Spawn two armor stands, two minecarts, and a boat
Run /ride @e[type=minecart,c=2] start_riding @e[type=armor_stand,c=1]
✅ One error message is produced
Run /ride @e[type=armor_stand,c=2] start_riding @e[type=minecart,c=1]
❌ Multiple messages are produced
Run /ride @e[type=armor_stand,c=2] start_riding @e[type=boat,c=1]
✅ One success message is produced

Expected behavior

In all cases, one feedback message should appear for one command

Observed behavior

In one case, multiple feedback messages appear

Notes

Due to MCPE-235945, other overloads of this command never produce errors.

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