fix docker-credential-gcr helper being called for multiple registries

[tejal29]

in this Pr,

• upgrade the docker-credential to v2.0.2 which supports --registries flag and --include-artifact-registry
• Kaniko, would only configure registry access for the first destination. Fix the presence of user provided docker config outside of loop.
  when we run docker-credential-gcr --registries=<first_registry> docker config file is written at /kaniko/.docker/config.json file is produced. Because the docker config file exists, we never run docker-credential-gcr for subsequent registries.

Test done.
Yes,

I tested locally

  docker run -it --entrypoint /busybox/sh -e GOOGLE_APPLICATION_CREDENTIALS=/kaniko/config.json \
 -v /usr/local/google/home/tejaldesai/.config/gcloud:/root/.config/gcloud  \
 -v /usr/local/google/home/tejaldesai/workspace/tejal-test.json:/kaniko/config.json \
  -v /usr/local/google/home/tejaldesai/workspace/example/my-app:/workspace gcr.io/kaniko-project/executor:debug-kavala

/ # /kaniko/executor -f Dockerfile --context=dir://workspace --destination=gcr.io/tejal-test/test --tarPath=workspa
ce/image.tar --destination=us-central1-docker.pkg.dev/tejal-test/suchist/test:latest --destination=us-central1-docker.pkg.dev/tejal-test/suchist/test:another

Verified an image uploaded to my artifactory.

https://screenshot.googleplex.com/6s3MAZ6kzPit3ir