Add Contract Event Topic Regression Tests

[Abd-Standard]

Description

Verify that contract events continue to emit the expected topic ordering and category information.

Acceptance Criteria

Event topic ordering is tested.

Event names are verified.

Category values are verified.

Tests detect accidental ABI/event-topic changes.

[hilaryy82-source]

@hilaryy82-source has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

i will like to work on this issues

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