chore: add check-releases script

[sissbruecker]

Description

Adds a script for checking whether new versions need to be released. The script does:

• Look up the last release commit and all commits added since then
• Determines the next patch version
• Generates an HTML file with that information for each maintained branch (branches are currently hard-coded)
• Opens the HTML file using Web Dev Server
• The HTML also contains branch-specific release instructions with specific steps, links and data that needs to be filled in

To use it:

• Define GITHUB_API_TOKEN in an env variable, for example with the .env file
• Run npm run check-releases

Type of change

• Internal

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot

See analysis details on SonarQube Cloud

[vursen]

Works great!

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.7.0.alpha10 and is also targeting the upcoming stable 24.7.0 version.