Rename docker image to use ci-image:name syntax

[clee2000]

This changes the docker image names from executorch/name:commitsha to executorch/ci-image:name-commitsha

I changed the docker image calculation step at some point to allow tags have names and still have the .ci/docker hash. By changing the names from name:commitsha to ci-image:name-commitsha, it is no longer necessary to create new ecr repos on AWS whenever a new name is added, which only a few people can do. Instead, everything will go under ci-image with tags

Testing: Run CI, if any job pull the old image, its bad. Not sure how to check tho

Pros:

• no longer need to wait for one of the people with permissions to create new ecr repo

Cons:

• xkcd about standards
• not sure how often new image names need to be created (probably not often at this point)
• dont fix what isnt broken
• testing this change is probably not super thorough

[pytorch-bot]

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[huydhn]

LGTM! Thank you for the fix, now we don't to manually create new entries for ExecuTorch anymore