41705: Support clearing selection from getSelected()

[labkey-nicka]

Rationale

Issue 41705 outlines the desire to have a clearSelected parameter made available from query-getSelected.api. This is the endpoint that backs LABKEY.DataRegion.getSelected(). For more in-depth discussion see LabKey/LabDevKitModules#55 (comment).

Related Pull Requests

• 41705: Support clearing selection from getSelected() testAutomation#789

Changes

• Support clearSelected for both the form-based and viewContext-based variants of DataRegionSelection.getSelected().
• Add clearSelected parameter support into client-side DataRegion.getSelected() wrapper.
• Add a regression test is run as a part of DataRegionTest.
• Refactor DataRegionSelection by removing redundant logic, streamlining null handling, and the following:
  • Centralize logic for computing session key in getSessionAttributeKey().
  • getSet() is now @NotNull safe as it will always provide a non-null value.
  • Centralize logic for fetching a QueryView from a QueryForm.
  • Remove redundant logic from setSelectionForAll that is found in getDataRegionContext().
  • Coalesce logic for handling fetching a selection from a ResultSetRowMapFactory into createSelectionList().
• Update client-side Data Region selection API wrappers always POST as they may mutate server state. Additionally, use payload for parameters rather than URL parameters.