[12.x] Enhance Queue Delay Test Coverage with Additional Edge Cases

[roshandelpoor]

This PR enhances the test coverage for the Queue Delay functionality by adding five new test cases that cover various edge cases and method chaining scenarios. The additions ensure more robust testing of the queue delay implementation.

New Test Cases Added:

1. test_queue_with_custom_delay: Verifies custom delay values different from default
2. test_queue_with_zero_delay: Tests explicit zero delay setting via delay() method
3. test_queue_with_negative_delay: Ensures proper handling of negative delay values
4. test_chaining_multiple_delay_calls: Validates behavior when delay is set multiple times

Benefits

• Improved code coverage for queue delay functionality
• Better validation of edge cases
• Verification of method chaining behavior
• Enhanced testing of delay value precedence
• Additional validation of delay-related method interactions