Address review feedback: simplify toError and add changeset

- Remove JSON.stringify fallback from toError, use the same unknown
  error messaging as stringifyError for all non-string/non-error values
- Add try/catch to protect against values that throw on string
  conversion (e.g. null-prototype objects, symbols)
- Fix no-op `void toError(err)` in DeleteEntityConfirmationDialog
- Fix `${err}` producing [object Object] in UrlReaderProcessor
- Fix double toError call in openStackSwift
- Update JSDoc to accurately describe the behavior
- Add tests for throwing toString and circular objects
- Add changeset for all refactored packages

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

plugins/techdocs-node/src/stages/publish/openStackSwift.ts

@@ -222,8 +222,9 @@ export class OpenStackSwiftPublish implements PublisherBase {
 
           resolve(techdocsMetadata);
         } catch (err) {
-          this.logger.error(toError(err).message);
-          reject(new Error(toError(err).message));
+          const error = toError(err);
+          this.logger.error(error.message);
+          reject(error);
         }
       } else {
         reject({