Improve Package Registry metadata generation
The intention of improving the metadata generation for Package Registry to is to be more performant and maintain best-in-class reliability.
Part of the outcome of https://gitlab.com/gitlab-org/gitlab/-/issues/338485+ will be to expand this collection of issues further.
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## Owners
* Team: [Package Registry](https://about.gitlab.com/handbook/engineering/development/ops/package/package-registry/)
* Most appropriate slack channel to reach out to: `#g_package-registry`
* Best individual to reach out to: @dmeshcharakou
* PM: @trizzi
* EM: @ckroutil
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