Refs #24583

Input workspace history needs to be copied to output workspaces. In
the case of groups, where an output replaces an input, the input history
can disappear before we have time to copy it to the output.
Refs #24372

The pointer to the last workspace should be declared before the for loop
otherwise it will always be a nullptr.

Re #0

The test were performing a multiplication instead of addition/
subtraction.

Re #0

ConjoinXRuns should not care if the workspaces have same bins, only that
they look like blocks.

Re #24462

Refs #21231

Refs #24372

They appear to change the API in the javascript layer without fully
reflecting it in the documentation. This even affects the older python
API mantid uses.

Also remove unit test