Print individual client test results and report timeouts as failures

[abdelaziz-mahdy]

Problem

Client-side tests only printed aggregate counts (PASSED: N, FAILED: N) without individual test names or assertion details. Server-side tests printed each test name with SUCCESS/FAILURE lines. When client tests timed out, the report showed TESTS: 0 with no indication of failure.

Solution

Match client test output to server test behavior: print each test name and its SUCCESS/FAILURE lines after completion. Propagate actual failure messages from the browser to the server report. Detect browser timeouts and report them as explicit failures.

Changes

• TestBorder.js: Push FAILURE output lines from each test into testRun.failures (previously only pushed test ID)
• TestRunnerScript.js: Add reportClientTestDetails() to print individual client test output matching server-side format
• TestRunnerScript.js: Detect incomplete TestRun after BrowserAgent timeout and record an explicit timeout failure

[jlhughes]

I won't be commenting on this PR, other than to say I provided a complete alternative to client testing that I believe would have been a better starting point for additional features.
#4729