Allow filtering search results by state (issues/merge requests) and confidentiality (issues)
## Problem When searching for issues or merge requests there is no way to filter out the closed or confidential issues. ## Solution Our Elasticsearch index already includes the `state` and `confidential` of issues, merge requests. We should allow the user to filter this value when doing a search for issues or merge requests. Breaking the work up into multiple Issues. Ideally the UI work should be done prior to the API work if at all possible. All MRs should try to include all relevant documentation changes. * Issues UI changes * Merge Requests UI changes * Issues API changes * Merge Requests API changes
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