EOL annotation fails when EOL Dockerfiles exist but images do not exist in ACR

[mthalman]

There can be circumstances where the EOL annotation logic will fail when attempting to query the metadata about an image in the ACR, where the image does not exist.

This occurs when the following conditions occur:

• A .NET version has become EOL (such as 6.0) and the build has marked all of those images as EOL.
• Those Dockerfiles are not yet removed from the repo.
• ACR cleanup has run which deletes those EOL images from the ACR.
• A subsequent build runs which builds Dockerfiles other than the EOL ones.

The issue here is in the generateEolAnnotationData command. It will see that the EOL Dockerfiles exist and that they should be added to the list of digests to be annotated here: https://github.com/dotnet/docker-tools/blob/6c08c3f30f8a88e21e5539d37ce5133a61aaa049/src/Microsoft.DotNet.ImageBuilder/src/Commands/GenerateEolAnnotationDataCommand.cs#L204-L229. The problem is that the images shouldn't have been added in the first place, or at least checked to see whether they exist before attempting to get their metadata.

Example failing build (internal link)

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