Tighten Google CDN URL config requirements
What does this MR do and why?
Specifying a URL without https://
is invalid. If the scheme is omitted, mark the configuration invalid so the CDN will not be used.
This came up in https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/16467.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Stan Hu