Iss #131 - Add logic to lookup user by Github ID when available

An issue exists where there are inconsistencies with the email used for commits and the associated Github user account. To patch this, a change was made to optionally include the Github username in the validation request. This will be used first when doing lookups of the user, falling back on the default flow if not set.

requested review from @zacharysabourin

added 4 commits

• 191aef8b...b0ad9cae - 2 commits from branch eclipsefdn/it/api:main
• 873bae72 - Iss #131 (closed) - Add logic to lookup user by Github ID when available
• 2f2a1c27 - Add tests that allow for checking external ID field works as intended

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approved this merge request

merged

mentioned in commit 827ee153