plugins: tsconfig: add strictNullChecks

[DhairyaMajmudar]

Description

1. Adding "strictNullChecks": true in typescript config file for plugins
2. After adding so there were some build failures which are now fixed.

Fixes: #2911

Testing

1. Run npm run build: Package is building fine w/o any warnings or errors

[sniok]

thanks for taking a look into this!

plugins/headlamp-plugin project doesn't really have it's own typescript files, it only copies some from frontend/ project so setting strictNullChecks isn't very beneficial

I'd recommend starting from individual plugins in https://github.com/headlamp-k8s/plugins repo

or if you want to try working on the frontend/ part, you could try enabling strictNullChecks fixing some errors and then disabling it, so it's easier to do bit by bit and not all at once

[DhairyaMajmudar]

thanks for taking a look into this!

plugins/headlamp-plugin project doesn't really have it's own typescript files, it only copies some from frontend/ project so setting strictNullChecks isn't very beneficial

I'd recommend starting from individual plugins in https://github.com/headlamp-k8s/plugins repo

or if you want to try working on the frontend/ part, you could try enabling strictNullChecks fixing some errors and then disabling it, so it's easier to do bit by bit and not all at once

Thank you for letting me know, let me first start with the frontend/ parts by parts.