* Enhance search functionality with new query filters and utility functions
- Added multiple test cases for searching issues with various query filters in `issues_test.go`.
- Introduced utility functions in `search_utils.go` to check for specific filters and extract repository information from queries.
- Created comprehensive tests in `search_utils_test.go` to validate the new filtering logic and ensure accurate query parsing.
* Refactor repository filter extraction in search utilities
- Renamed `extractRepoFilter` to `hasRepoFilter` to simplify the function's purpose.
- Updated test cases in `search_utils_test.go` to reflect the new function name and logic.
- Adjusted tests to focus on the presence of the `repo:` filter rather than extracting owner and repo details.
* Enhance search functionality with additional query filters and utility functions
- Added new test cases for searching pull requests and users with various query filters in `pullrequests_test.go` and `search_test.go`.
- Implemented a utility function `hasTypeFilter` in `search_utils.go` to check for the presence of `type:` filters in queries.
- Updated the search handler to conditionally prepend the `type:` filter based on the presence of existing filters, improving query handling.
* Updated both regex patterns to handle this edge case
Gökhan Arkan