[gitlab-org/gitlab] Auto-merge (MWCP) does not respect "Skipped pipelines are considered successful" project setting

### ROOT CAUSE The auto-merge condition in the `MergeWhenPipelineSucceeds` class does not properly account for the project setting "Skipped pipelines are considered successful". Specifically, it fails to check if a pipeline is skipped and the setting is enabled before considering it successful. This causes auto-merge to not trigger even when the pipeline is skipped and the setting is enabled. ### CODE FIX ```ruby class MergeWhenPipelineSucceeds def should_merge?(pipeline) return true if pipeline.success? if pipeline.skipped? project = pipeline.project return true if project.settings["ci_skipped_pipelines_are_successful"] end # ... existing code ... end end ``` This change adds a condition to check if the pipeline is skipped and if the project setting is enabled before considering it successful. This ensures the auto-merge condition respects the project setting.