Fix make assets

[saswatamcode]

Pertaining issues

#3892

Changes

Fixes make assets command, which failed earlier due to a react-scripts issue. Currently pkg/ui/react-app uses react-scripts version 3.4.4. This leads to a typescript version issue which causes the command to fail during building the react app with the following error,

./src/utils/index.ts
  Line 0:  Parsing error: Cannot read property 'map' of undefined


error Command failed with exit code 1.

Downgrading to typescript version 3.9.9 fixes this issue. Upgrading react-scripts is not feasible at the time due to the caveats mentioned here.

Verification

make assets now runs smoothly,

$ react-scripts build
Creating an optimized production build...
Compiled successfully.
.
.
.
The project was built assuming it is hosted at ./.
You can control this with the homepage field in your package.json.

The build folder is ready to be deployed.

Find out more about deployment here:

  bit.ly/CRA-deploy

✨  Done in 138.33s.
>> deleting asset file
>> writing assets
>> formatting go code
>> formatting shell scripts

[bwplotka]

It looks good to me, let's see what @prmsrswt says 🤗

[onprem]

LGTM, thanks!