CAMEL-19358 - changes to address flakiness of KafkaConsumerFullIT test

[jvsingh]

Description

changes to address flakiness of KafkaConsumerFullIT test:

• unique topic & route names
• ensure topic is actually deleted in @AfterEach
  These changes are intended to prevent clashes between different tests producing & consuming from the same topic

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[orpiske]

LGTM, thanks!