[Microsoft.Build] Bump timeout for BuildSubmissionTest.EndBuildWaitsForSubmissionComp...

[Microsoft.Build] Bump timeout for BuildSubmissionTest.EndBuildWaitsForSubmissionCompletion. (#8556)

https://jenkins.mono-project.com/job/test-mono-pull-request-coop/3429/testReport/junit/(root)/BuildSubmissionTest/EndBuildWaitsForSubmissionCompletion/

```
BuildSubmissionTest.EndBuildWaitsForSubmissionCompletion

Failing for the past 1 build (Since Unstable#3429 )
Took 36 sec.
add description
Stacktrace
                                                MESSAGE:
                                                  #5
  Expected: less than or equal to 00:00:02.5000000
  But was:  00:00:09.1408213

                                                +++++++++++++++++++
                                                STACK TRACE:
                                                  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0003b] in /mnt/jenkins/workspace/test-mono-pull-request-coop/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
```