refactor: replace substr with slice and remove dead code in singleCon… #4098

Job	Run time
Install Script (macos-latest)	29s
OCI Implementation Registry Compatibility	1m 9s
Install Script (ubuntu-latest)	27s
CLI	39s
Tests Matrix (src/test/container-features/e2e.test.ts)	3m 44s
Tests Matrix (src/test/cli.build.test.ts)	9m 21s
Tests Matrix (src/test/container-features/containerFeaturesOCIPush.test.ts)	54s
Tests Matrix (src/test/cli.test.ts)	1m 5s
Tests Matrix (src/test/cli.exec.nonBuildKit.2.test.ts)	5m 1s
Tests Matrix (src/test/cli.exec.buildKit.1.test.ts)	5m 18s
Tests Matrix (src/test/container-features/featuresCLICommands.test.ts)	2m 46s
Tests Matrix (src/test/cli.exec.buildKit.2.test.ts)	5m 9s
Tests Matrix (src/test/cli.podman.test.ts)	2m 32s
Tests Matrix (src/test/container-features/containerFeaturesOrder.test.ts)	46s
Tests Matrix (--exclude src/test/container-features/containerFeaturesOrder.test.ts --exclude src/...	6m 44s
Tests Matrix (src/test/cli.up.test.ts)	5m 19s
Tests Matrix (src/test/imageMetadata.test.ts)	6m 3s
Tests Matrix (src/test/cli.exec.nonBuildKit.1.test.ts)	5m 1s
Tests	3s
	1h 2m 30s

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