Restore Windows PowderReduceP2DTest

[ktactac-ornl]

Description of work

PowderReduceP2DTest was previously disabled due to it throwing an error on windows builds. Since then, it now functions as expected. This PR simply re-enables the test.

Summary of work

The test was re-enabled, removing the skipTests mark.

EWM 7050: [mantid] Fix PowderReduceP2DTest to run on Windows and OSX.
Related to: #37720
Sibling: #39051

Further detail of work

A build was triggered and found to be working. A second build confirmed this. A third failed. 4th passed. 5th passed.
4/5 build attempts have passed - considering this test to be functional

To test:

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[peterfpeterson]

I don't understand why it works now either, but turning it back on works for me.

[ktactac-ornl]

A third build caused a failure. Seeing what a fourth will do

[ktactac-ornl]

Fourth passes. And now starting a fifth...

[ktactac-ornl]

5th passed

[thomashampson]

Is there a link to the build where this test passed on Windows?

[ktactac-ornl]

Is there a link to the build where this test passed on Windows?

@thomashampson Here's the most recent: https://builds.mantidproject.org/job/pull_requests-conda-windows/9860/

[thomashampson]

Is there a link to the build where this test passed on Windows?

Here's the most recent: https://builds.mantidproject.org/job/pull_requests-conda-windows/9860/

The system tests aren't run on Windows in PRs.

[ktactac-ornl]

Is there a link to the build where this test passed on Windows?

Here's the most recent: https://builds.mantidproject.org/job/pull_requests-conda-windows/9860/

The system tests aren't run on Windows in PRs.

facepalm We took the passing to mean it was ok. Was waiting on a local windows build to manually run the test as final confirmation, which evidently was needed.

[ktactac-ornl]

Reverting in #39068