Migrate nx to 15

[mvdicarlo]

Ensure that react and electron migrate to 15 successfully and build in exe without white screen.

[leaftail1880]

Would like to assign this to me.

[mvdicarlo]

pleaase ensure nx-electron also gets updated

[mvdicarlo]

@leaftail1880 I had to revert your PR.
When it merged into main it was no longer able to build the ui portion.
I tested your branch before merging into main and it was fine, but something breaks when merging the two.

[leaftail1880]

@mvdicarlo looks like main ovverided some package bumps. Ill look into it

[leaftail1880]

looked deeper into it. Original problem was related to caniuse lite, strict resolve of this module has helped. However, after running yarn start it does not shows icons. This is related to webpack dynamic import, or webpack version and/or plugins that have been changed after migrating and extracting managed webpack config to apps/postybirb-ui/webpack.config.js.

Requires a lot of digging.

[mvdicarlo]

https://github.com/mvdicarlo/postybirb/tree/users/mvdicarlo/v16
Created my own branch attempt and just pushed up to v16 and put in vite.
Just need to solve the whole dynamic import problem that exists because eui components use dynamic import svgs for whatever reason.

[leaftail1880]

Dynamic icon importing is known issue and there is workarounds for that here

However, i need to manually mix your solution and mine because we both applied some pathes (for mine thats eslintrc changes and test fixes). I can do that after a week, most likely on 9th october