Fix TypeScript type issues for Jest tests #565

Job	Run time
build-storybook-docs	1m 19s
build-deploy-diracx-web-dev-image	16m 38s
release-please	0s
build-deploy-library-package	0s
build-deploy-diracx-web-release-image	0s
deploy-storybook-docs	-1s
	17m 56s

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