CI: Fix SNMP failures in Github CI on Windows

[LamentXU123]

I think the cause of #21919 might be race condition. The test suite start when the SNMP service in 127.0.0.1 is not (fully) installed.

So I wrote a small script to check and wait before the service is usable and let the test start to run. This might be helpful in the remote to fix the CI :)

After this PR is tackled we can close #21919 , TiA.

[iluuu1994]

This is not super plausible. From https://github.com/php/php-src/actions/runs/25172619354/job/73795997139, with timestamps enabled:

As you can see, the first failing test appears ~15 minutes after test have started running.

[LamentXU123]

This is not super plausible. From https://github.com/php/php-src/actions/runs/25172619354/job/73795997139, with timestamps enabled:

Ah yes, and also not all SNMP tests are failing. Some of them pass, some of them don't. And in each time the passed&failed tests are different. See https://github.com/php/php-src/actions/runs/25172619354/job/73795997139 and https://github.com/php/php-src/actions/runs/25187112602/job/73847232154

Would it be more reasonable to be a frequency issue...? The server couldn't handle many SNMP requests in short time ranges so some tests fails to reach the server.

(Idk I am just guessing, tests work fine locally in my Windows machine)

[iluuu1994]

Not sure, the tests are already sequentialized using the CONFLICTS file.