Feat: Support multipart/mixed (#7155)

* feat(): support multipart mixed

fix: support vars interpolation on mixed multi-part

Update packages/bruno-electron/src/ipc/network/interpolate-vars.js

Co-authored-by: Timon <39559178+Its-treason@users.noreply.github.com>

refactor: use startsWith

feat: best effort for other multipart/* contentypes

* feat: enhance variable interpolation for multipart requests

- Updated `interpolateVars` function to support interpolation in multipart/form-data and multipart/mixed requests.
- Added handling for empty multipart arrays and parts with missing or undefined values.
- Improved type checks for content types to ensure proper interpolation behavior.

Includes new tests to validate the interpolation functionality for multipart requests.

* fix: normalize error handling in sendRequest and improve test reliability

---------

Co-authored-by: Alfonso Presa <alfonso-presa@users.noreply.github.com>

packages/bruno-requests/src/scripting/send-request.ts

@@ -58,9 +58,16 @@ const createSendRequest = (config?: SendRequestConfig) => {
       } catch (error) {
         return Promise.reject(error);
       }
-    } catch (error) {
+    } catch (error: any) {
+      // Normalize axios error for callback: tests expect error.status (e.g. 404), but axios
+      // puts the status on error.response.status. Setting status here ensures the same
+      // behaviour in nodevm (--sandbox developer, used in CI) and in QuickJS (safe sandbox).
+      const errForCallback
+        = error && typeof error.response?.status === 'number'
+          ? { ...error, status: error.response.status }
+          : error;
       try {
-        await callback(error, null);
+        await callback(errForCallback, null);
       } catch (err) {
         return Promise.reject(err);
       }