Use FoundationEssentials where possible #30

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Soundness / Swift license headers check	10s
Soundness / Check generated code	1m 14s
Unit tests / Construct unit test matrix	3s
Soundness / Broken symlinks check	4s
Soundness / Documentation check	1m 22s
Soundness / API breakage check	1m 37s
Soundness / Format check	37s
Soundness / License headers check	5s
Soundness / Python lint check	6s
Soundness / Shell check	35s
Soundness / Unacceptable language check	4s
Soundness / YAML lint check	3s
Unit tests / Unit tests / Linux (6.0)	1m 19s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 33s
Unit tests / Unit tests / Linux (nightly-main)	1m 25s
Cxx interop / Cxx interop / Linux (6.0)	1m 18s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 27s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 31s
	14m 35s

Provide feedback