Source image error handling

[jessebye]

Issue #, if available:
aws-controllers-k8s/community#1842

Description of changes:
Requeues the function reconciliation if it errors due to an image not existing. It will attempt reconciliation again after 1 minute. This allows for handling common GitOps conditions that may occur, where the function manifest is updated to use a new image URI, but the image hasn't finished pushing yet.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

Hi @jessebye. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[RedbackThomson]

Super fast work, and a great solution

[jessebye]

@RedbackThomson feedback addressed 😄

[RedbackThomson]

/lgtm

[a-hilaly]

👍
/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: A-Hilaly, jessebye, RedbackThomson

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