fix: use eslint env instead of individual globals

[achingbrain]

Setting the value to false means it is not writable

[hugomrdias]

maybe its better to set env instead of this https://eslint.org/docs/user-guide/configuring.html#specifying-environments

also for globals (https://eslint.org/docs/user-guide/configuring.html#specifying-globals) it should be readonly or writable

[achingbrain]

I tried setting the env, it thinks globalThis is undefined with { browser: true, node: true }.

[hugomrdias]

is Blob and others also undefined or its just globalThis? with env browser ?

[achingbrain]

I can make it happy with:

  env: {
    es2020: true,  // for globalThis
    browser: true, // for Blob
    node: true
  },

[achingbrain]

Setting es2020: true might finally solve ipfs/aegir#487 too

[hugomrdias]

seems better, what do you think ?

we can remove the globals all together, we already have /* eslint-env mocha */ in the test files