Remove feature flag and don't use group packages finder anymore

Dzmitry (Dima) Meshcharakourequested to merge
569886-remove-packages-projects-finder-feature-flag into master

Context

In Replace group packages finder (!214548 - merged) we have introduced the changes to replace the existing Group packages finder with the combination of Packages projects finder and Projects packages finder. This'll simplify the further changes required for UNION queries in REST API & GraphQL: read entries from packages_... (!205189).

The changes were implemented behind the feature flag. The feature flag was enabled on gitlab.com for all users on 2025-12-10.

What does this MR do and why?

Remove feature flag packages_projects_finder and don't use group packages finder anymore.

References

Screenshots or screen recordings

No.

How to set up and validate locally

The steps to verify the changes are described here (only omit the feature flag switch).

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #569886

Edited by Dzmitry (Dima) Meshcharakou

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