[8.1] Reduce port range re-use in tests (#85777) #85859
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Today we select the port range to use in tests by taking the Gradle worker ID mod 223. We now use significantly more than 223 Gradle workers in each test run which means port ranges are re-used, resulting in spurious failures. This commit replaces the magic number 223 with a computation defined in terms of the available ports and the number of ports to allocate per worker. It also reduces the number of ports per worker to 30 to try and reduce the frequency of port clashes.
DaveCTurner
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Backports the following commits to 8.1: