fix: Prevent scope from storing more than 100 breadcrumbs at the time

[kamilogorek]

Sentry.configureScope(scope => {
  for (let i = 0; i < 1000; i++) {
    scope.addBreadcrumb({ message: 'hi' })
  }
})

This would store 1000 crumbs, despite having hard limit of 100, as this limit was stored in the Hub, and not Scope where it should. cc @timfish

fixes #2963
fixes getsentry/sentry-electron#205
fixes getsentry/sentry-electron#277

[rhcarvalho]

We could also specifically check for which 5 breadcrumbs we want: last, first, etc. I think it should be last N, right?

[rhcarvalho]

Removing this could break downstream dependencies. Could we leave it in?

[github-actions]

size-limit report

Path	Size
@sentry/browser - CDN Bundle (gzipped)	20.98 KB (+0.06% 🔺)
@sentry/browser - Webpack	21.85 KB (+0.05% 🔺)
@sentry/react - Webpack	21.89 KB (+0.05% 🔺)
@sentry/browser + @sentry/tracing - CDN Bundle (gzipped)	28.37 KB (+0.06% 🔺)