Proxy settings not used for data (e. g. blob storage)

**Describe the bug**
When using BatchExplorer behind a proxy, it is not possible to connect to a blob storage (data tab). BatchExplorer is trying to connect directly to the internet.

**To Reproduce**
Steps to reproduce the behavior:
1. Start BatchExplorer behind a proxy with configure proxy server.
2. Click on 'Data'
3. Select your storage account and click 'Refresh'
4. A timeout error occurred

**Expected behavior**
See contents of your blob storage.

**Logs**
`{"0":{"code":"ETIMEDOUT","details":[],"message":"connect ETIMEDOUT 20.150.8.4:443","original":{"address":"20.150.8.4","code":"ETIMEDOUT","errno":"ETIMEDOUT","innerError":{"address":"20.150.8.4","code":"ETIMEDOUT","errno":"ETIMEDOUT","innerError":{"address":"20.150.8.4","code":"ETIMEDOUT","errno":"ETIMEDOUT","innerError":{"address":"20.150.8.4","code":"ETIMEDOUT","errno":"ETIMEDOUT","innerError":{"address":"20.150.8.4","code":"ETIMEDOUT","errno":"ETIMEDOUT","port":443,"syscall":"connect"},"port":443,"syscall":"connect"},"port":443,"syscall":"connect"},"port":443,"syscall":"connect"},"port":443,"syscall":"connect"},"timestamp":null},"level":"error","message":"Error loading data in ListView for BlobContainer","timestamp":"2020-09-17T08:32:25.431Z"}`

**Version**
- OS: Windows 10 2004
- Version 2.7.0-stable.418