[ui] Export of Chart and Images takes way longer in Rancher extension than in standalone UI

[thehejik]

Setup

• Epinio version: v1.11.0-rc1-1-g96ce9dbc
• Epinio UI version: extension epinio-1.11.0-2
• Browser type & version: vivaldi/chrome

Describe the bug
When testing #265 I noticed that exporting of Chart and Images in Rancher extension is stuck for ~7minutes in Compressing Files stage. The same app can be exported over standalone UI within ~1min.

To Reproduce

• deploy rancher v2.8.0-rc3
• install epinio dev over rancher
• install E extension
• deploy an app over E extension in Rancher
• after deployment try to export the app by using three dots menu and select Chart and Images

Result
The export is stuck for a while and user doesn't know if anything is going on.

Expected Result
The export time should be similar as in standalone UI so around ~1minut for php sample app using default jammy builder

Screenshots

We were fixing the compression performance some time ago via #254