Add a new utility function for finding deploys

flatpak_find_deploy_for_ref_in is a variation of
flatpak_find_deploy_for_ref that allows to restrict
what installations to search in.

Closes: #2158
Approved by: alexlarsson
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f