build: enable isolatedModules

David Sveningssonrequested to merge
refactor/isolated-modules into master

Gets rid of the warning:

ts-jest[ts-compiler] (WARN) message TS151002: Using hybrid module kind (Node16/18/Next) is only supported in "isolatedModules: true". Please set "isolatedModules: true" in your tsconfig.json. To disable this message, you can set "diagnostics.ignoreCodes" to include 151002 in your ts-jest config. See more at https://kulshekhar.github.io/ts-jest/docs/getting-started/options/diagnostics

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