[SwiftKit] Move 'selfPointer' to 'JNISwiftInstance' & downcall trace logs #725

Job	Run time
Benchmark (JMH) (jammy swift:6.1.2 jdk:corretto)	7m 18s
Test (Java) (macos swift:6.1.2 jdk:corretto)	2m 30s
Test (Java) (jammy swift:6.1.2 jdk:corretto)	2m 49s
Test (Swift) (macos swift:6.1.2 jdk:corretto)	5m 0s
Sample JavaDependencySampleApp (jammy swift:6.1.2 jdk:corretto)	6m 0s
Sample SwiftAndJavaJarSampleLib (jammy swift:6.1.2 jdk:corretto)	4m 35s
Sample JavaSieve (jammy swift:6.1.2 jdk:corretto)	2m 4s
Test (Swift) (jammy swift:6.1.2 jdk:corretto)	5m 49s
Sample JExtractJNISampleApp (jammy swift:6.1.2 jdk:corretto)	4m 48s
Sample JavaSieve (macos swift:6.1.2 jdk:corretto)	4m 42s
Sample JavaDependencySampleApp (macos swift:6.1.2 jdk:corretto)	7m 9s
Sample JavaProbablyPrime (jammy swift:6.1.2 jdk:corretto)	4m 38s
Sample JavaProbablyPrime (macos swift:6.1.2 jdk:corretto)	4m 40s
Sample SwiftAndJavaJarSampleLib (macos swift:6.1.2 jdk:corretto)	6m 0s
Sample JExtractJNISampleApp (macos swift:6.1.2 jdk:corretto)	5m 50s
Sample JavaKitSampleApp (macos swift:6.1.2 jdk:corretto)	6m 14s
Sample JavaKitSampleApp (jammy swift:6.1.2 jdk:corretto)	4m 45s
soundness / Documentation check	35s
Sample SwiftKitSampleApp (macos swift:6.1.2 jdk:corretto)	6m 33s
soundness / Shell check	33s
soundness / Unacceptable language check	3s
soundness / Broken symlinks check	4s
soundness / License headers check	7s
soundness / Python lint check	6s
soundness / YAML lint check	4s
Sample SwiftKitSampleApp (jammy swift:6.1.2 jdk:corretto)	5m 38s
soundness / Format check	0s
soundness / API breakage check	0s
	1h 38m 34s

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