Updated LoadSpec to be a file loader

[dlcaballero16]

Description of work

Summary of work

Made changes to make LoadSpec a file loader, removed file from banned
list since LoadSpec is now a file loader

EWM Item: 10859

To test:

Make sure LoadSpec now behaves like a file loader and that test LoadLotsOfFiles.py passes.

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[sf1919]

This needs a milestone and labels please

[sf1919]

The doc tests are failing because the New Features folder in Data Handling part of the release notes is new. You need to update the top level release note accordingly to pick up your release note. See https://developer.mantidproject.org/Standards/ReleaseNotesGuide.html#adding-sub-headings for information on how to do that.

Once the doc tests are fixed the packaging tests should pass too.

[dlcaballero16]

The doc tests are failing because the New Features folder in Data Handling part of the release notes is new. You need to update the top level release note accordingly to pick up your release note. See https://developer.mantidproject.org/Standards/ReleaseNotesGuide.html#adding-sub-headings for information on how to do that.

Once the doc tests are fixed the packaging tests should pass too.

Ok I just updated the top level, hopefully I did this correctly. Though I noticed there wasn't already a sub heading for both Deprecated and Removed for Data_Handling, so not sure how those builds were passing before

[backmari]

Looks good! I have verified that the system test LoadLotsOfFiles.py runs and I can also use the generic Load algorithm to load a "spec" file and the correct loader is seen in the history.