Kafka exceptionHandler: retry when message is too large, log when writing to Kafka fails

[piotrp]

Describe your changes

Log errors that are thrown from Kafka producer. Try to somehow handle situations where we try to write exception info that is too large to log.

Checklist before merge

• Related issue ID is placed at the beginning of PR title in [brackets] (can be GH issue or Nu Jira issue)
• Code is cleaned from temporary changes and commented out lines
• Parts of the code that are not easy to understand are documented in the code
• Changes are covered by automated tests
• Showcase in dev-application.conf added to demonstrate the feature
• Documentation added or updated
• Added entry in Changelog.md describing the change from the perspective of a public distribution user
• Added MigrationGuide.md entry in the appropriate subcategory if introducing a breaking change
• Verify that PR will be squashed during merge

[github-actions]

created: #6961
⚠️ Be careful! Snapshot changes are not necessarily the cause of the error. Check the logs.

[piotrp]

I pushed a change that makes variable removal function public - I need it in a custom exception serializer