chore: remove bundlesize in favour of size-limit

[belgattitude]

I'd like to remove bundlesize. Why ?

• We introduced size-limit (and npm run check-size in the QA improve checks #1969 and subsequent PR's). I feel it's an easier tool.
• Bundlesize is relying on itorb (node-gyp), this makes install slower as it has to be compiled for no so much benefits (minus 15 seconds in install).
• I also separate check-size from test-e2e. (I feel it's clearer IMO, but open any changes here)

npm why iltorb
iltorb@2.4.5 extraneous
node_modules/iltorb
  iltorb@"^2.4.3" from brotli-size@0.1.0
  node_modules/brotli-size
    brotli-size@"0.1.0" from bundlesize@0.18.1
    node_modules/bundlesize

[belgattitude]

@adrai let me know your opinion on this.

[adrai]

@adrai let me know your opinion on this.

ok for me... you're the expert here ;-)