Refactor test to verify behavior instead of implementation details

[Copilot]

The test testProcessBatchTooLargeWithNineEvents was asserting that insertStatement.bind() is called exactly 18 times for 9 events, coupling the test to internal implementation details. This makes the test brittle—any optimization or refactoring that changes how often bind is called would break the test even if behavior remains correct.

Changes

• Removed exact count assertion on insertStatement.bind() calls (was: times(18))
• Changed batch execution verification to atLeast(2) to verify retry mechanism triggers without prescribing exact retry count
• Simplified mock setup by removing redundant BoundStatement instances
• Added clarifying comments on what behavior is being tested

The test now validates that:

• Batch-too-large exceptions trigger the retry mechanism
• Multiple batch execution attempts occur as expected
• Processing completes successfully

This follows the principle of testing observable behavior rather than internal mechanics.

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