* tests: Replace !errors.Is(err, target) with testify equivalents
* codebase: Manual !errors.Is(err, target) replacements
* typo: Replace errMisMatchedEvent with errMismatchedEvent
* tests: Enhance error messages for better output
* tests: Refactor error assertions in various test cases to use require and improve clarity
* misc linter: Fix assert should wording
* tests: Simplify assertions in TestCreateSignals for clarity and conciseness
* tests: Enhance assertion message in TestCreateSignals