[Engineering System] Increase Timeout for Live Tests (#6129)

Due to the current state of the Event Hubs test suite, a live test run for
a given platform is taking roughly 90 minutes on average.  Because Windows is
running two target platforms, the test run has been averaging roughly 2 hours
and 30 minutes.

The last couple of days have seen the Windows tests fail to complete in the
allowed timeout window, surpassing the 155 minute mark, though it is believed that
they would have completed if given another 5 minutes.

Until we're able to refactor the Event Hubs tests for test timings, isolation,
and parallelization, adjusting the timeout to allow nightly runs to complete
without timing out.

.azure-pipelines/tests.yml

@@ -15,9 +15,9 @@ variables:
 jobs:
   - job: 'Test'
 
-    # Increase timeout so Event Hubs tests do not timeout (Windows runs for ~2h 25m, on average due to having two target platforms)
+    # Increase timeout so Event Hubs tests do not timeout (Windows runs for ~2h 35m, on average due to having two target platforms)
     # https://github.com/Azure/azure-sdk-for-net/issues/5982
-    timeoutInMinutes: 155
+    timeoutInMinutes: 175
 
     strategy:
       maxParallel: $[ variables['MaxParallelTestJobs'] ]