feat: add assert event unit test

[somotochukwu-dev]

Add unit tests for assert_event_topic_matches helper

Changes

creator-keys/tests/events.rs

• Updated assert_event_topic_matches panic message to include expected and actual topic values: "event topic mismatch: expected {:?}, got {:?}" so topic mismatches are immediately diagnosable.
• Updated existing test_assert_event_topic_matches_rejects_unexpected_identifier to match the new panic message format.
• Added 4 new unit tests:
  • test_assert_event_topic_matches_panics_on_buy_vs_sell_mismatch — emits a buy event and calls helper with sell topic, asserts panic.
  • test_assert_event_topic_matches_passes_on_matching_topic — emits a buy event and calls helper with buy topic, asserts no panic.
  • test_assert_event_topic_matches_panics_when_no_topics — passes an event with empty topics, asserts panic with "event topic should be present".
  • test_assert_event_topic_mismatch_message_identifies_topics — uses catch_unwind to verify the panic message contains both expected and actual topic names.

Closes #648

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[Chucks1093]

Fix the CI