set failing code for url-loader, if data fetching fails

[bariela]

Description

url-loader service always exited with code 0, even when it failed to fetch data,
setting exitCode to 1 if any of data is not loaded, but still attempting all of them

Motivation and Context

How has this been tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have read the CONTRIBUTING document.
• I have checked to ensure that there aren't other open Pull Requests for the same update/change.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.