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

ℹ️ Repo Maintainers: To accept this application, review their application or assign @hilaryy82-source to this issue.

[kosisochukwu1234]

@kosisochukwu1234 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

please assign. you will get a pr before deadline

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kosisochukwu1234 to this issue.