Fix system tests for RabbitMQ 3.13.x

[Zerpet]

Summary

• Increase memory allocation from 700Mi to 1Gi to support RabbitMQ 3.13.x which requires more memory out of the box
• Improve system test helpers with Ginkgo best practices for cleaner and more reliable test execution

Changes

• Memory Allocation: Increased memory requests and limits from 700Mi to 1Gi in 3 test locations to accommodate RabbitMQ 3.13.x requirements
• Resource Management: Removed explicit channel close in AMQPS publisher to reduce resource pressure during tests
• Test Improvements:
  • Use GinkgoHelper() for proper error reporting in test helper functions
  • Change EventuallyWithOffset to return error instead of bool for cleaner error handling
  • Fix ExpectWithOffset offset values in nested callbacks
  • Replace defer GinkgoRecover() with GinkgoHelper() for consistency

Test Plan

• Run system tests against RabbitMQ 3.13.x cluster to verify tests pass with increased memory allocation
• Check that test output is cleaner and more readable with Ginkgo improvements

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