refactor: simplify synthetic task creation with UserCacheConfig helpe… #353

Job	Run time
Test (namespace-profile-mac-default, aarch64-apple-darwin)	55s
Test (windows-latest, x86_64-pc-windows-msvc)	6m 45s
Test (ubuntu-latest, x86_64-unknown-linux-gnu)	2m 19s
Test (namespace-profile-mac-default, x86_64-apple-darwin)	2m 30s
Lint	1m 36s
done	3s
	14m 8s

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