Fix Deleting Images and Images Disappearing

[parkerra]

Fix Deleting Images and Images Disappearing

When a user tries to delete an image, the image is deleted in Backblaze but it wasn't deleted in the dog's image field. Also, the image was attempted to be re-uploaded every time a dog was edited which was causing images to disappear, so that behavior has been changed.

Checklist

• [x] Requirements have been implemented
• [x] Acceptance criteria is met
• [x] Database schema docs have been updated or are not necessary
• [x] Relevant reviewers (EM) have been assigned to this PR

Critical Changes

• Database change / migration to run
• Environment config change
• Breaking API change

How To Test

Re-seed the database, then try uploading an image, deleting an existing image, uploading an image after deleting an image, and replacing an image after uploading one.

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