Description

In macOS unusual-path failures, these tests can time out in waitForInitialBreak() even after the debugger has attached and returned to the prompt.

This PR narrows synchronization in tests that do not assert initial break ... in output:

• test/parallel/test-debugger-watch-validation.js
  • failed CI log: https://github.com/nodejs/node/actions/runs/21772762644/job/62823422649
• test/parallel/test-debugger-extract-function-name.mjs
  • failed CI log: https://github.com/nodejs/node/actions/runs/22266947520
• test/parallel/test-debugger-random-port-with-inspect-port.js
  • failed CI log: https://github.com/nodejs/node/actions/runs/21785139333/job/62855280668

For those tests, waitForInitialBreak() is replaced with waitFor(/Debugger attached\./) (plus waitForPrompt() where needed), so they sync on attach/prompt rather than the break banner.

This change is intentionally scoped to test synchronization only and does not modify test/common/debugger.js behavior.

Testing

• ./tools/test.py -p actions parallel/test-debugger-watch-validation
• ./tools/test.py -p actions parallel/test-debugger-extract-function-name
• ./tools/test.py -p actions parallel/test-debugger-random-port-with-inspect-port

Refs: #61762