Advanced search: verify planner role is supported for issue search

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Problem to solve

The planner role was introduced in #482733 (closed).

Issue search is dependent upon two things: project visibility_level and issues_access_level.

The documentation (https://docs.gitlab.com/user/permissions/#project-planning) state that planner should be able to view confidential issues. This works in the issues list but I cannot get it working for search. I created a private project with a confidential issue and it's not searchable.

Proposal

Verify that the planner role is working as intent for for Issue search. The Search::Elastic::WorkItemQueryBuilder class is where the Elasticsearch query is built.

note: Update role and permissions docs (search was introduced in !189550 (merged))