Perfomance: Set `app.bundle.js` `bundlesize` limit back to 400kb

Created by: umpox

Issue type

Internal request

Problem description

We had to increase the bundle size temporarily due to two main reasons:

• General bundle bloat, due to increased logic in main bundle (e.g. more advanced NPS widget)
• Multiple migrations ongoing that result in extra dependencies:
  • React Router: v5 to v6
  • Tooltip: Reactstrap to Radix
  • Icon: mdi-react to @mdi/js

This issue is to ensure we reduce it again once we have removed those dependencies.

Context

https://sourcegraph.slack.com/archives/C02FLQDD3TQ/p1656423973130869

Steps to reproduce

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Impact

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Additional details

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