[DNM] pin-bundle-images: resolve fork tags from Quay under local registry CI

[amartyasinha]

When LOCAL_REGISTRY=1 and the go.mod module path is not under
openstack-k8s-operators, keep bundle pullspecs on IMAGEREGISTRY but
query Quay for bundle tag digests. Upstream modules still use the
local registry v2 tags/list path when mirrored.

Do not merge: just to make content-provider CI pass on #1900

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[github-actions]

OpenStackControlPlane CRD Size Report

Metric	Value
CRD JSON size	322464 bytes (315KB)
Base branch size	322464 bytes
Change	+0.00%
Status	yellow — growing

Threshold reference

Color	Range	Meaning
🟢 green	< 300KB	Comfortable
🟡 yellow	300–400KB	Growing
🟠 orange	400–750KB	Concerning
🔴 red	> 750KB	Approaching 1.5MB etcd limit (cut in half to allow space for update)