Add support for registry_mirrors

[sluongng]

Most of the PR was generated by Github Copilots.

[sluongng]

I tested it manually with BuildBuddy repo with

--- a/WORKSPACE
+++ b/WORKSPACE
@@ -536,6 +536,7 @@ oci_pull(
     name = "busybox",
     digest = "sha256:c230832bd3b0be59a6c47ed64294f9ce71e91b327957920b6929a0caa8353140",
     image = "mirror.gcr.io/library/busybox:1.36.1",
+    registry_mirrors = ["mirror.gcr.io"],
     platforms = ["linux/amd64"],
 )

and common --override_repository=rules_oci=/Users/sluongng/work/misc/rules_oci.

Then do

> bazel clean --expunge

> bazel query @busybox//... --repository_cache=

and got this build event on the server side

{
    "id": {
        "fetch": {
            "url": "https://mirror.gcr.io/v2/library/busybox/manifests/sha256:c230832bd3b0be59a6c47ed64294f9ce71e91b327957920b6929a0caa8353140"
        }
    },
    "fetch": {
        "success": true
    }
}

[sluongng]

hmm i missed that I double set the mirror in oci_pull... need to fix it a bit more

[apesternikov]

It could be very useful to have an ability to configure all parts of the mirrored image location, not just a registry. It is a common use case to mirror external images to a private repository with additional prefix using https://github.com/fasterci/rules_gitops/tree/main/mirror. Is it possible to expose an additional images[] parameter?