[spytheman]

Make diagnosing flaky tests easier, on the CI and locally, without having to run them manually first.

It now shows all the lines below starting with >>>:

                 retrying 1/3 of vlib/x/vweb/tests/vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v ; known flaky: true ...
                 retrying 2/3 of vlib/x/vweb/tests/vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v ; known flaky: true ...
                 retrying 3/3 of vlib/x/vweb/tests/vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v ; known flaky: true ...
>>> flaky failures so far:
>>>>>> ---------------------------------------------------------------------------------------------------- retry: 0 ; max_retry: 3 ; r.exit_code: 1 ; trimmed_output.len: 1149
>>>>>> 2024-10-31T16:19:23.728582Z [DEBUG] testsuite_begin
>>>>>> 2024-10-31T16:19:23.728601Z [INFO ] working curl_executable found at: /usr/local/bin/curl
>>>>>> 2024-10-31T16:19:23.728604Z [DEBUG] starting watchdog thread to ensure the test will always exit one way or another...
>>>>>> 2024-10-31T16:19:23.728838Z [DEBUG] starting webserver...
>>>>>> [Vweb] Running app on http://localhost:23013/
>>>>>> 2024-10-31T16:19:23.735121Z [DEBUG] webserver started
>>>>>> 2024-10-31T16:19:23.748160Z [INFO ] > test_curl_connecting_through_ipv4_works
>>>>>> 2024-10-31T16:19:23.748577Z [INFO ] > test_net_http_connecting_through_ipv4_works
>>>>>> 2024-10-31T16:19:23.765041Z [INFO ] > test_curl_connecting_through_ipv6_works
>>>>>> /space/v/oo/vlib/x/vweb/tests/vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v:86: ✗ fn test_net_http_connecting_through_ipv6_works failed propagation with error: dial_tcp failed for address ::1:23013
>>>>>> tried addrs:
>>>>>>  0.0.0.0:0: net: socket error: 111; code: 111
>>>>>> 
>>>>>>    86 |  res := http.get('http://[::1]:${port}/')!
>>>>>> 2024-10-31T16:19:23.765479Z [DEBUG] testsuite_end
>>>>>> ---------------------------------------------------------------------------------------------------- retry: 1 ; max_retry: 3 ; r.exit_code: 1 ; trimmed_output.len: 1149
>>>>>> 2024-10-31T16:19:23.786566Z [DEBUG] testsuite_begin
>>>>>> 2024-10-31T16:19:23.786598Z [INFO ] working curl_executable found at: /usr/local/bin/curl
>>>>>> 2024-10-31T16:19:23.786602Z [DEBUG] starting watchdog thread to ensure the test will always exit one way or another...

etc...

_{Huly®: V_0.6-21163}