Allow both service_worker and scripts in MV3 Web Extensions #3216

Job	Run time	Billable time
Benchmarks	13m 47s	0s
TypeScript types	1m 34s	0s
Lint	1m 7s	0s
Flow	1m 3s	0s
Integration tests (ubuntu-latest, Node 18)	8m 14s	0s
Integration tests (macos-latest, Node 18)	9m 2s	0s
Build REPL	10m 26s	0s
Integration tests (windows-latest, Node 18)	20m 24s	0s
Unit tests (ubuntu-latest, Node 18)	3m 7s	0s
Integration tests (ubuntu-latest, Node 20)	7m 16s	0s
Unit tests (macos-latest, Node 18)	2m 46s	0s
Integration tests (macos-latest, Node 20)	7m 21s	0s
Unit tests (windows-latest, Node 18)	8m 1s	0s
Integration tests (windows-latest, Node 20)	18m 17s	0s
Unit tests (ubuntu-latest, Node 20)	3m 18s	0s
Unit tests (macos-latest, Node 20)	3m 6s	0s
Unit tests (windows-latest, Node 20)	10m 43s	0s
	2h 9m 32s	0s

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