Use GraphQL properties in frontend and remove from work_items_helper

What does this MR do and why?

This change migrates work item metadata from server-rendered data to GraphQL queries, eliminating duplication between the Ruby helper and frontend data layer.

Changes:

• Add GraphQL fields for paths and permissions to work_item_metadata query
• Expose new computed properties in WorkItemMetadataProvider component
• Remove redundant data attributes from work_items/index.js bootstrap
• Clean up work_items_helper.rb by removing properties now fetched via GraphQL
• Update specs to reflect removal of server-rendered properties

The following properties are now fetched via GraphQL:

• autocompleteAwardEmojisPath, newTrialPath, newIssuePath, groupPath
• releasesPath, projectImportJiraPath, exportCsvPath
• canBulkUpdate (adminIssue), canEdit (adminProject)
• canImportWorkItems/showImportButton (importWorkItems)

This reduces initial page payload and centralizes data fetching through GraphQL, improving maintainability and performance.

References

Related to #578974

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Related to #578974