include auth for FetchOptions

[ygelfand]

Fixes regression introduced in v1.7.0 referenced #719 (comment) (and potentially earlier issues).

Description

FetchOptions needs auth also for private repos

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• Includes unit tests
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Reviewer Notes

• The code flow looks good.
• Unit tests and or integration tests added.

Release Notes

Fixes private repo branch checkout

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[ygelfand]

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[hallvors]

Is this the fix for #1786 and friends?

[ygelfand]

Is this the fix for #1786 and friends?

no this is on the (git) context fetch side, that one looks to be on the image push side.