Refactor Polarization Corrections Tests

[adriazalvarez]

Description of work

This is a maintenance issue. Many of the tests for the sans polarization corrections algorithms can share similar test data, however every tests for each polarization algorithm has its own set of helper functions to create a workspace group suitable for polarization algorithms. I have tried to unify all this helper functions into a new file PolarizationCorrectionsTestsUtils, which is already recycled from a helper file used in the analyser efficiency tests.
The two main changes are the inclusion of a helper function createPolarizedTestGroup that can be used in all the polarization correction tests and a struct to hold the main parameters of the workspaces and efficiency functions.

Note: I have set the release to 6.15 as there is no hurry to get this reviewed before code freeze for 6.14 if there are more important PRs to review.

No associated issue.

To test:

• All tests are passing.

Release notes no necessary as it is internal change for tests only

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