chore: Update publish workflow to use Flutter commands and improve pa… #19

Job	Run time
Check version consistency	3s
Validate pub.dev requirements (gameframework_unreal, engines/unreal/dart)	25s
Test gameframework_unreal	1m 8s
Test gameframework_unity	40s
Validate pub.dev requirements (gameframework, packages/gameframework)	36s
Test gameframework	1m 50s
Test gameframework_unity	1m 57s
Test gameframework_unity	44s
Test gameframework	40s
Test gameframework_unreal	41s
Validate pub.dev requirements (gameframework_unity, engines/unity/dart)	34s
Test gameframework_unreal	1m 50s
Test gameframework	1m 32s
	12m 40s

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