Remove SchemaRegistry TestContainers from integration tests

[Copilot]

The SchemaRegistry TestContainer is no longer needed for integration tests as the framework now handles schema registration internally via Kafka topics.

Changes

Removed SchemaRegistry container from three crypto-trading test files:

• CryptoTradingQueryApiTest.java
• CryptoTradingCommandApiTest.java
• CryptoTradingApplicationTest.java

For each file:

• Removed GenericContainer field declaration for schemaRegistry with Confluent Schema Registry configuration
• Removed akces.schemaregistry.url property from test initializers
• Removed GenericContainer import

Tests continue to use KafkaContainer and PostgreSQLContainer where needed.

Original prompt

Remove all schemaRegistry TestContainer from all tests in all modules that have integration tests. Ensure all tests compile, you don't need to run them since the schemaregistry container is not used anymore

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