refactor!: remove obsolete test files and utilities

- Deleted `no-orphaned-files.spec.js` and `test-files-handling.spec.js` as they are no longer needed.
- Removed utility files: `context.js`, `index.js`, `mocks.js`, `patterns.js`, and `ruleTester.js` to streamline the testing setup.
- Introduced `utils.js` to consolidate utility functions for rule testing.
- Updated `vitest.config.ts` to include all source files for coverage reporting.
- Added new utility functions in `utils.js` for parsing rule options, checking component files, and handling file patterns.
- Implemented new tests for file component naming conventions in `file-component-naming.test.js`.
- Created comprehensive tests for utility functions in `utils.test.js`.

Author: andrewmolyuk