Introduce explicit permission read_project_runners instead of using admin_project

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The following discussion from !103994 (merged) should be addressed:

• @philipcunningham started a discussion:

  thought/question

  admin_project works fine here but i wonder if this should be something more granular, like the other user abilities (e.g. :read_group_all_available_runners). perhaps with this could happen in a follow-up with some advice from a subject-matter expert 🤔