checkForUnmatchedRequests

Checks for any unmatched requests by retrieving all request specifications that have not been matched to incoming requests and verifies that the list of unmatched requests is empty.

This method ensures that all request mappings have been used as expected. If there are unmatched requests, this would indicate that some defined mappings were not triggered during the testing or execution process.

Uses the findAllUnmatchedRequests function to identify unmatched requests and asserts that no unmatched requests exist.