[core] Remove platform dance in Package.swift #346

Job	Run time
Semantic Version label check	4s
musl	1m 25s
Unit tests / Construct unit test matrix	4s
Integration Tests / Test archive plugin	2m 23s
Soundness / API breakage check	1m 48s
Integration Tests / Test Examples/APIGateway on 6.0.1-amazonlinux2	1m 21s
Soundness / Documentation check	1m 34s
Integration Tests / Test Examples/BackgroundTasks on 6.0.1-amazonlinux2	1m 16s
Soundness / Format check	38s
Integration Tests / Test Examples/HelloJSON on 6.0.1-amazonlinux2	1m 19s
Soundness / License headers check	4s
Soundness / Unacceptable language check	3s
Integration Tests / Test Examples/HelloWorld on 6.0.1-amazonlinux2	1m 19s
Soundness / Broken symlinks check	3s
Integration Tests / Test Examples/S3_AWSSDK on 6.0.1-amazonlinux2	4m 9s
Soundness / Python lint check	4s
Soundness / Shell check	31s
Integration Tests / Test Examples/S3_Soto on 6.0.1-amazonlinux2	5m 1s
Integration Tests / Test Examples/Streaming on 6.0.1-amazonlinux2	1m 15s
Swift 6 Language Mode / Swift 6 language mode	1m 9s
Soundness / YAML lint check	3s
Unit tests / Unit tests / Linux (6.0)	1m 22s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 32s
Unit tests / Unit tests / Linux (nightly-main)	1m 35s
	30m 2s

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