Improve extension activation when subfolders are swift packages #1145

Job	Run time
Package Extension	2m 14s
Test / Windows (6.0 - windows-2022)	28m 57s
Test / Windows (6.1 - windows-2022)	21m 24s
Test / Windows (5.9 - windows-2022)	16m 19s
Test / Linux (5.10 - jammy)	5m 37s
Test / Linux (5.9 - jammy)	6m 19s
Test / Linux (6.0 - jammy)	9m 44s
Test / Linux (6.1 - jammy)	8m 9s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Soundness / Unacceptable language check	4s
Soundness / Broken symlinks check	5s
Soundness / Shell check	31s
Soundness / Python lint check	8s
Soundness / YAML lint check	4s
Soundness / Documentation check	0s
Soundness / Format check	0s
Soundness / API breakage check	0s
Soundness / License headers check	0s
	1h 39m 35s

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