[varunj-msft]

Description

Stacked on #4051. This PR's own changes: varunj-msft/PyRIT@varunj-msft/13178-Save-Converters-Scorers...varunj-msft/13178-Save-Converters-From-Registry

This is one of the changes for saving Registry entries across restarts. It builds on #4051, which saves converters and scorers created through the API. Until the earlier PRs merge, the diff here also shows their changes.

The New Converter dialog only made converters that are gone after the backend restarts, wherever it opens: the Converters tab, the converter panel in chat, and New converter in the technique editor. It now saves them by default, and the Converters and Scorers tables say which entries come back.

• The dialog suggests a name from the type that no listed converter has, such as base64_converter. Keeping the _converter ending stays clear of the names the startup scripts register (base64, rot13), which would stop a saved converter of that name from restoring. The name field checks the backend's rule for saved names. A name the list already has, or one the backend says is taken (409), shows on the field, and focus moves there.
• When a converter can't be saved, the button reads Create as Temporary and a warning says why: the type can't be saved, a file is uploaded, the chosen target is Temporary, or the backend refused those exact values (typed 400). Changing a refused value goes back to Save Converter. A file removed from a new converter is no longer sent. The warning uses role="status" so screen readers read it out, and target options mark Temporary targets.
• GET /api/converters/types adds not_saveable_reason to each type, from the checks a save runs, including the one for types that need an uploaded file. The dialog keeps no copy of those rules.
• The Converters table labels each converter Saved, From configuration or Temporary. A saved converter's Remove button is disabled, with a tooltip saying how to remove it for now. The Scorers table shows the same labels.
• Save to registry on a converter's changed settings still makes a Temporary copy, and its dialog now says so.
• The origin label moves from Config/TargetOriginBadge.tsx and utils/targetOrigin.ts to Registry/OriginBadge.tsx and utils/registryOrigin.ts. The target files change imports only.
• The GUI doc covers saving converters and removing a saved one for now.

Screenshots: a new converter saves by default, a converter that uses a Temporary target is offered as Temporary with the reason, and the Converters table before and after a restart.

Not covered:

• Removing a saved converter in the GUI comes with deleting saved entries, in a later PR. Until then a converter saved from the dialog stays until its file is deleted and the backend restarted, as the tooltip and the GUI doc say.
• Showing who saved each converter or scorer, with a filter for your own, is the next PR. Saving scorers and techniques from the GUI, saving copies, and editing saved converters come later.