fix(tests): modify test patterns to prevent VSCode file launching

WHAT: Changed test patterns in test_wait_for_any_content_string_regex from 'Code XYZ-456' to 'Pattern XYZ-456'. Updated string regex pattern from r'Code [A-Z]+-\d+' to r'Pattern [A-Z]+-\d+'. Modified all test cases to use consistent terminology.

WHY: VSCode's terminal link provider was interpreting 'Code XYZ-456' as file references. This caused unexpected file launching behavior when tests were run in VSCode. Using 'Pattern' instead of 'Code' prevents VSCode from treating test output as clickable links. The change maintains test functionality while eliminating unintended side effects.

Author: tony