chore: add app for making releases

[sissbruecker]

Description

This repurposes the check-releases script into an Electron app that guides through the release process and can automate some small things.

• It shows the same branch data as before: maintained branches, current version, next patch version, commits since last release
• It has the same release instructions as the previous script
• The app has two web views arranged in a horizontal split:
  • The left view shows the release instructions
  • Clicking any link in the release instructions (e.g. link to Bender build) opens that link in the right pane. That makes it more convenient than the old script which opened links in a new tab, as you can now view both side-by-side.
• In addition, when opening a Bender build page the Electron app injects a script that automatically opens the custom build dialog and prefills values such as release branch, version, tag
• It's now also possible to customize the release version so that it you can do more than patch releases
• The release instructions now have a step for updating flow-components versions

Since the app runs a separate browser instance it requires entering credentials for Bender + Github when opening those for the first time.

The app can be run with yarn release-app.

Type of change

• Internal

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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