* 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
* GHA, tests: Add additional checks for common issues
These checks include:
- Ensuring that all testify funcs use their formatted variants (e.g., `assert.Equalf(t, expected, actual)` instead of `assert.Equal(t, expected, actual)`).
- Replacing `%s` with %q
- Enforcing consistent usage of should/must wording for testify assert/require messages
* Add support for checking backticked string format specifiers and fix issues
* tests: Fix error comparisons
* tests: Replace errors.Is(err, nil) usage with testify and automate check
* refactor: Rename ExtractPort to ExtractPortOrDefault
* tests: Replace assert with require for error handling in multiple test files
* tests: Replace assert with require for error handling and improve assertions in data tests
* tests: Fix typo in assertion message for StreamVol test
* OKX: Fix GetOpenInterestAndVolumeStrike test with instrument selection and improved assertions
* OKX: Revert intentional error check
* Improve error message for expiry time check in GetOpenInterestAndVolumeStrike test
