Finalize migration to Vite (Drop Webpack)

[cconard96]

Checklist before requesting a review

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• This change requires a documentation update. (Dev docs mention webpack)

Description

Relies on #22356, #24550, and #24549

• Drops Webpack completely in favor of Vite for a new, faster, simpler and more streamlined frontend build process.
• Drops over 15 dependencies, adds 2. Swaps sass for sass-embedded which is the faster version that Vite recommends.

TODO:

• Copy Tabler RTL CSS
• Try slimming Monaco build more

Total npm run build time:

• Webpack: 25s
• Vite: 20s

Build times should improve more whenever the JS gets modernized because:

• The current use of require prevents tree-shaking making our bundles even more bloated.
• Tabler alone is very big (700kb of CSS when compiled). Takes Vite 8 seconds to build.
• Normally Vite only supports a single entrypoint in library build mode and the workaround spawns new build environments for every bundle which is probably not very efficient.
• Vite normally inlines assets like CSS inside the JS in library build mode but I had to implement a plugin to extract them because Tabler has a ton of resources we would never use like legacy TTF/WOFF fonts and it made the file size even more unreasonable. 70% of the time spent on the Tabler bundle is taken within the vite-plugin-lib-assets plugin.