Due security reasons, we had to stop using the dispatch token and
start using the GitHub App in order to trigger the deployment in
argo.  Because argo is a private repository, we can't trigger from
a public one (juno), so then we start to change the approach to first
push the docker images to jFrog Artifactory, then argo will be notified
that a new image was pushed, then it will trigger the deployment

Extra Tasks:
- Run YAML formatter on build-and-deploy workflow:
Having a well formated file makes it easier to read and for people
to contribute

- Remove unnecessary IMAGE_TAG from build-and-deploy.yml:
Instead of using both env.DOCKER_IMAGE_TAG and output.IMAGE_TAG, only
use one of them.

- Improve readability of stages in build-and-deploy.yml:
Rename stages to make it easier to understand what's going on.
For example from 'deploy_to_dev' to 'validate_dev' in order to
include that some tests will be run on the environment

- Set common env var in the root of the file:
Some of the env vars are being used in multiple stages,
so instead of having to hard-code some small differences
in multiple places, bring it all back to a root level
where it's easier to see what changes for what environment.