[MCPE-236164] /scoreboard players test and reset produce multiple lines of output

The bug

Most commands are supposed to produce exactly one success message or one failure message upon completion. This includes most overloads of /scoreboard. However, the /scoreboard players test and /scoreboard players reset overloads produce a separate message for each affected entity.

When testing:

Result	Expected output	Actual output
No targets matched	One error message	❌ An error message per target
Some targets matched, some didn’t	One success message	❌ A success/error message per target
All targets matched	One success message	❌ A success message per target

When resetting:

Result	Expected output	Actual output
All targets reset	One success message	❌ A success message per target

How to reproduce

Spawn a few cows
Run /scoreboard objectives add test dummy
Run /scoreboard players set @e[type=cow] test 5
✅ One message is produced
Run /scoreboard players set @e[type=cow,c=2] test 0
Run /scoreboard players test @e[type=cow] test 0
❌ Multiple messages are produced
Run /scoreboard players test @e[type=cow] test 2
❌ Multiple messages are produced
Run /scoreboard players test @e[type=cow] test 10
❌ Multiple messages are produced
Run /scoreboard players reset @e[type=cow] test
❌ Multiple error messages are produced

Expected behavior

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

Observed behavior

In these cases, multiple feedback messages appear

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