Improve waiting for the server is in use by the signal that a marker file is created by the build task

[GangWang01]

Fixes #8956

Context

#8956 (comment)

Changes Made

Improve waiting for the server is in use by the signal that a marker file is created by the build task.

Testing

Notes

[rainersigwald]

It's generally not a good idea to have timeouts like this, or to increase them without detailed data indicating why.

Is it possible to get a distinct signal from the second process that it's going, perhaps a line on stdout or a file that acts as a marker?

[GangWang01]

It's generally not a good idea to have timeouts like this, or to increase them without detailed data indicating why.

Is it possible to get a distinct signal from the second process that it's going, perhaps a line on stdout or a file that acts as a marker?

Thanks for the suggestion! It's possible to let the build task create a marker file as the signal.

[rainersigwald]

This looks so much better!

[JanKrivanek]

It now looks much more solid then the original test - thanks!