Fix Docker meta action for releases (#28232)

Fix Docker meta action for releases (#28232)

Should fix #28229 and #28230 for next release.

Assuming I'm reading the docs correctly for the docker meta action:

https://github.com/docker/metadata-action#flavor-input
https://github.com/docker/metadata-action#latest-tag

1. We want `latest=false` for the RCs.
2. `latest` should happen already due to `auto` mode, however there's an
extra option for the `suffix` flavor.

This PR is ready, but leaving it as draft to make sure someone
double-checks my sleuth-work.

Signed-off-by: jolheiser <john.olheiser@gmail.com>