kubernetes kit demo for Vaadin 24

[SebastianKuehnau]

Description

I created a running demo for Vaadin 24 and fixed the following issues:

1. registry definition (remove localhost:5001) for the image from app-v*.yml files.
2. set the default image pull policy to always in the app-v*.yml files (imagePullPolicy: Always)
3. remove line-awesome and replace it
4. update exampledata library (org.vaadin.artur.exampledata.exampledata:3.4.0)
5. add snakeyml library to make application.yml file readable
6. make the contact form sessions replicatable

Fixes # (issue)

1. update the registry configuration
2. update the image pull policy definition
3. removed
4. updated to com.vaadin.exampledata:6.2.0
5. added
6. fixed issues in the ContactForm and in the application.yml file

Type of change

• Bugfix
• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.

Additional for Feature type of change

• Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[heruan]

Sorry for reviewing nine months later, this kinda slipped from our hands when the new 6-w project started. It would still be useful to update the demo to the latest Flow version, if you'd like to fix the current conflicts!