Use FoundationEssentials where possible #31

Job	Run time
Soundness / Check generated code	1m 16s
Cxx interop / Construct Cxx interop matrix	3s
Soundness / Swift license headers check	4s
Unit tests / Construct unit test matrix	4s
Soundness / Broken symlinks check	3s
Soundness / API breakage check	1m 40s
Soundness / Documentation check	1m 18s
Soundness / Format check	30s
Soundness / License headers check	3s
Soundness / Python lint check	8s
Soundness / Shell check	36s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	4s
Cxx interop / Cxx interop / Linux (6.0)	1m 10s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 23s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 31s
Unit tests / Unit tests / Linux (6.0)	1m 18s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 28s
Unit tests / Unit tests / Linux (nightly-main)	1m 34s
	14m 16s

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