[test] Reduce compile time of test:karma in watchmode drastically #24967
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When running
yarn test:karmalocally compilation on rebuild should now be dramatically faster in the best case scenario (minimal number of files changed).The initial build is still "slow". Though I did some quick testing locally and re-building went from 20s to <1s when changing a test file.
Following the recommendation in https://webpack.js.org/configuration/devtool/#devtool for
eval-source-map: