Update Golang Testing Setting in CI

The golang container image we are using is currently denying service to us, this merge request workaround-ed them by moving to use our own mirror of these images:

Running with gitlab-runner 17.8.1 (a1fca00e)
  on ci-runner-x86-02-main __hc2zXq, system ID: s_39a8ec4bc83a
  feature flags: FF_NETWORK_PER_BUILD:true
Preparing the "docker" executor 04:48
Using Docker executor with image golang:1.21-bullseye ...
Pulling docker image golang:1.21-bullseye ...
WARNING: Failed to pull image with policy "always": initializing source docker://golang:1.21-bullseye: reading manifest 1.21-bullseye in docker.io/library/golang: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (manager.go:254:125s)
Attempt #2: Trying "if-not-present" pull policy
Pulling docker image golang:1.21-bullseye ...
WARNING: Failed to pull image with policy "if-not-present": initializing source docker://golang:1.21-bullseye: reading manifest 1.21-bullseye in docker.io/library/golang: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (manager.go:254:156s)
ERROR: Job failed: failed to pull image "golang:1.21-bullseye" with specified policies [always if-not-present]: initializing source docker://golang:1.21-bullseye: reading manifest 1.21-bullseye in docker.io/library/golang: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit (manager.go:254:156s)