GraphQL support for list wiki pages

Richard Chanrequested to merge
601275-list-wikis-graphql into master

What does this MR do and why?

  • Adds GraphQL support for listing wiki pages, which is required to power the list_wiki_pages MCP tool
  • Introduces the GraphQL query, resolver, and type definitions needed to fetch wiki pages for a given project or group
  • This MR is a prerequisite for !240973 (merged), which creates the MCP tool itself

Notes for reviewer

  • File changes: A few of the changed files are auto-generated GraphQL files.
  • Feature flag: This MR does not put the new GraphQL changes behind a feature flag. The GraphQL changes introduced here are marked as experiment for now, and include read_wiki authorization, so the risk of unintended exposure is should be low. Please advise if this assumption is incorrect.

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Related to #601275

Edited by Richard Chan

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