ci: switch to use cloud builders for native multi-arch support

[Nithos]

Initial test using the docker cloud builder for building and pushing multi-arch images.
This PR completely replaces the shared CI workflow with one that is set up to leverage Docker Cloud Builders. Secrets have been pushed to leverage the builder within its configuration. Fundamentally not much has changed other than 'where' the work is being done. Things to consider:

1. This is experimental feature that has limited CI minutes (not GH CI minutes), please use sparingly.
2. Triggers are set for push to main and tag
3. Bake file updated to leverage the metadata action from the CI, local builds are still available.
4. Removed the other bakefiles that were separated for individual architecture builds, simply use docker buildx bake for local builds leveraging local architecture

NOTE: If builds fail please notify me, we may have run through our allocated minutes
NOTE: There is an option that we could run local AMD builds on GH directly for testing, and only build both arch for prod use, but for now to keep things simply we are leveraging the cloud builder for all and its cache system.

[Nithos]