Fix release api milestone not found

What does this MR do?

This MR fixes the bug in Release API: #37266 (closed)

When a Release is to be updated with a Group Milestone, it returned the error Milestone not found. This was due to a missing parameter in MilestoneFinder, which is called by ReleaseUpdater. It missed the param group_ids. After this fix, an extra validation was necessary to set up in MilestoneRelease model. It only checked wether the milestone and the release is in the same group. In our case, this check is replaced wether the milestone's group is the same as the release's projects's group.

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