Remove blossom-ci.yaml

[elezar]

No description provided.

[elezar]

@ArangoGutierrez @mikemckiernan the actions around docker files need to be reworked too. Since we're just removing the blossom-ci in this PR the failures are definitely unrelated.

One thing I noticed is that the dockerfile-changed job should probably just use the docker login action instead of logging in manually.

      - name: Log in to Container Registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}