Do not fail on error 502 during restart actions (#1941)

In some rare cases a reverse proxy stops forwarding traffic to scm,
before the response is returned to scm.
In such a case the reverse proxy returns 502 (bad gateway),
so we treat 502 not as error for restart actions.

Co-authored-by: Eduard Heimbuch <eduard.heimbuch@cloudogu.com>

scm-ui/ui-api/src/errors.ts

@@ -79,6 +79,15 @@ export class UnauthorizedError extends Error {
   }
 }
 
+export class BadGatewayError extends Error {
+  statusCode: number;
+
+  constructor(message: string, statusCode: number) {
+    super(message);
+    this.statusCode = statusCode;
+  }
+}
+
 export class TokenExpiredError extends UnauthorizedError {}
 
 export class ForbiddenError extends Error {