chore: update test messages in `constants/float16` #18324

Job	Run time
Update copyright header years	0s
Auto-fix lint errors	0s
Merge changes from develop branch into this PR	0s
Rebase this PR on top of develop branch	-6s
Print a list of available slash commands	-6s
Add initial reaction	-8s
Post a comment with make command instructions	-8s
Remove in-progress label	-9s
Check for required files	-10s
	-47s

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