Remove remarks field from DTC in CSL

[Fixes #82735810]
Remove end_date field from ISN

[Fixes #82734234]
Remove type field in JSON from EL in CSL

[Fixed #82697276]
List CSL doc fields in alphabetical order.
Adjust CSL fixtures to match latest tweaks.
Merge pull request #66 from GovWizely/calum/csl-fixes

CSL tweaks
Removed rescue from importer, API V2 support.
Code coverage revisions.
Remove SharepointHelpers module.
Terser SharepointTradeArticleData#import.
Update trade_url field.