Stop considering docker pull image as runner system failure

What does this MR do?

With this MR, the docker pull image error is no more considered as a runner system error

Why was this MR needed?

What's the best way to test this MR?

Here are the configuration file needed to test this MR:

.gitlab-ci.yml

variables:
  DURATION: 60

job:
  script:
  - 'for i in $(seq 1 $DURATION); do echo $(date); sleep 1; done'
  - echo "done"

config.toml for docker executor

concurrent = 1
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "Local GitLab Runner for tests and debugging - Docker"
  url = "https://gitlab.com"
  token = "YOUR_TOKEN_HERE"
  executor = "docker"
  [runners.docker]
    tls_verify = false
    image = "dummyimage"
    privileged = false
    disable_entrypoint_overwrite = false
    oom_kill_disable = false
    disable_cache = false
    volumes = ["/cache"]
    shm_size = 0

config.toml for kubernetes executor

concurrent = 1
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "kubernetes"
  url = "https://gitlab.com/"
  token = "TOKEN_HERE"
  executor = "kubernetes"
  [runners.kubernetes]
    image = "dummyimage"
    privileged = true
    namespace = "default"

1. Run a job using the configurations above
2. The job fails with the following error:

Job Failure error for Docker executor

ERROR: Job failed: failed to pull image "dummyimage" with specified policies [always]: Error response from daemon: pull access denied for dummyimage, repository does not exist or may require 'docker login': denied: requested access to the resource is denied (manager.go:205:1s)

Job Failure error for Kubernetes executor

ERROR: Job failed: prepare environment: waiting for pod running: pulling image "dummyimage": image pull failed: rpc error: code = Unknown desc = Error response from daemon: pull access denied for dummyimage, repository does not exist or may require 'docker login': denied: requested access to the resource is denied. Check https://docs.gitlab.com/runner/shells/index.html#shell-profile-loading for more information

What are the relevant issue numbers?

closes: #27880 (closed), #28037 (closed)