MR: cleanup/vue-unused-components - components/*

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✅ Cleaned Components

1. mr_widget_how_to_merge_modal.vue

• Removed unused props: canMerge, targetBranch

2. mr_widget_migrate_jenkins.vue

• Removed unused prop: humanAccess

3. mr_widget_pipeline.vue

• Removed unused props: pipelineMustSucceed, mergeStrategy

• Removed unused computed properties: hasStages(), isMergeRequestPipeline

• Note: hasCi is indirectly used in test defaultProps in mr_widget_pipeline_spec.js — retained

• Note: pipelineEtag is referenced in mr_widget_pipeline_container_spec.js — retained

4. mr_widget_pipeline_container.vue

• Removed unused props: showCollapsedDeployments and multipleDeploymentsTitle

5. mr_widget_suggest_pipeline.vue

• Added alt attribute to image for accessibility
• Removed unused method()
• Removed unused tracking prop

Tests ran:

• lint:eslint for .vue files - PASSED!
• yarn run jest for spec files - PASSED!

Re #525778 (closed)