[MCPE-236149] /effect produces multiple lines of command output

The bug

Most commands are supposed to produce exactly one success message or one failure message upon completion. However, the /effect command produces multiple messages when applying or clearing effects from multiple entities.

When applying effects:

Result	Expected output	Actual output
All targets got an effect	One success message	❌ A success message per target

When clearing effects:

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

How to reproduce

Spawn a few mobs next to you
Run /effect @e[r=10] hunger
❌ Multiple error messages are produced
Run /effect @e[r=10] clear absorption
❌ Multiple error messages are produced
Run /effect @p absorption
Run /effect @e[r=10] clear absorption
❌ Multiple messages are produced
Run /effect @e[r=10] absorption
Run /effect @e[r=10] clear absorption
❌ Multiple messages are produced

Expected behavior

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

Observed behavior

In all cases, multiple feedback messages appear

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