Support --panic-unwind worker-build option #1094

Job	Run time
Formatter	2m 4s
Build worker-build (ubuntu-latest)	1m 30s
Build worker-build (windows-latest)	3m 6s
Test (windows-latest)	9m 53s
Examples	3m 7s
Test (panic-unwind)	3m 56s
Templates	1m 50s
Test (ubuntu-latest)	5m 29s
	30m 55s

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