Fixes and unit tests for AlignAndFocusPowder Refs #23888

[marshallmcdonnell]

Description of work.
Adds unit test for AlignAndFocusPowder with bug fixes found during the test development.

Bug fixes:

1. Non-event workspaces did not clone the input workspace, thus an empty workspace was returned
2. Calling AlignAndFocusPowder with the GroupingFilename it will extract the grouping workspace without applying the mask and pass this to the child algorithm DiffractionFocussing with the GroupingWorkspace argument. Yet if you call DiffractionFocussing with the GroupingFileName argument, it will go ahead and apply the mask. Thus, to make AlignAndFocusPowder with the GroupingFilename work the same way as DiffractionFocussing with the GroupingFileName argument, the mask is now applied to the grouping workspace passed to DiffractionFocussing as the GroupingWorkspace argument.

To test:

1. Build branch
2. Build the WorkflowAlgorithmsTest tests
3. Run the AlignAndFocusPowderTest test suite

Example script for step 2 and 3:
ninja && ninja WorkflowAlgorithmsTest && ctest -R AlignAndFocusPowderTest

NOTE: If it helps, for manually setting up the tests on HRPD test files in the ExternalDataStore, the following python script helped me plot results to figure out when I encountered bugs. (has .txt file extension so GitHub would let me upload)
alignfocuspowder_testing.txt

Fixes #8929, fixes #17840, and fixes #23888

Refs #17841, #19105, #19109, #22602, #23869, and #24386

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Reviewer

Please comment on the following (full description):

Code Review

• Is the code of an acceptable quality?
• Does the code conform to the coding standards?
• Are the unit tests small and test the class in isolation?
• If there are changes in the release notes then do they describe the changes appropriately?

Functional Tests

• Do changes function as described? Add comments below that describe the tests performed?
• Do the changes handle unexpected situations, e.g. bad input?
• Has the relevant (user and developer) documentation been added/updated?

Does everything look good? Mark the review as Approve. A member of @mantidproject/gatekeepers will take care of it.

[peterfpeterson]

Overall a great improvement as demonstrated by the bugs found and fixed. The changes requested are code style/convention.

[peterfpeterson]

It would be a good idea (follow-on PR) to make this the default functionality for CreateSampleWorkspace(Function='Powder Diffraction', ...) as having the instrument centered on two_theta=90 is fairly common.

[marshallmcdonnell]

Issue created #24411