refactor: remove unused fetchPackageMetadata and fetchPackageManifest… #3473

Job	Run time
list	31s
workflow (modules-builder-tests)	1m 50s
workflow (build-unit-tests)	2m 24s
workflow (build-cli)	1m 50s
workflow (devkit-core-tests-rerun)	1m 27s
workflow (devkit-core-tests)	1m 25s
	9m 27s

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