Handle Lambda timeouts in the Artemis Repo API

[Kamsiy]

Description

• Resolve Lambda timeout errors in the Artemis repo-handler
• Catch Lambda timeout errors from the Artemis repo-handler and handle them in Heimdall
• Reduce the number of items submitted to the Artemis repo API from 100 to 20 repositories
• Skip branches that have been deleted

Motivation and Context

How Has This Been Tested?

tested in a dev environment

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 change)
• Documentation change

Checklist

• My code follows conforms to the coding standards.
• 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.

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