Refs #24583

Enables specifying sample materials without a chemical formula or atomic
number in SetSampleMaterial and MaterialBuilder. It is now enough to
specify the scattering and attenuation cross sections and number
density.

Re #21466

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

Touches some 'obvious' cases where histograms were misused.

- Replace copies by references to x, y and e histogram data
- Use setSharedX, setSharedY, setSharedE instead of manually copying the
values
- std::move vector data to histograms
- Fix off-by-one errors in SaveReflThreeColumnAsciiTest,
SaveReflCustomAsciiTest, SaveANSTOAsciiTest and ISISEnergyTransfer
- Fix issues in RefAxisTest

Re #24462

This split out the material information into a new concept page, added
additional links between the various docs, and added a big note at the
top of `SetSample` that the dict definitions are in cm.

Fixes current requested changes

Refs #24408

Mock file search

Add extension search unit tests

Refs #24408

Mock out web service modules and add unit tests

Refs #24408

Refs #24408

Refs #24408

A `newAxisLength == oldAxisLength` should apply to both horizontal and
vertical axes.

Re #24355

Since github's REST API has a separate url to check how many calls are
left, find out and log it at the information level. Refs #24339.

Since github supplies the correct url in their json, just use it rather
than guess it from the html url. Refs #24339.

Rather than just generating a nonsense error message on failure, catch
and throw a `FileError` with a clear message of what went wrong.

Problem identified: sample log entries are not case sensitive. title, Title will not result in different SampleLog entries

Refs #24312