Werk #15043: Setup search: Limit number of results per topic to 80

When pressing Show all results for a topic, the search will now display at maximum 80 results. In case more results are available, a corresponding message will be displayed. This can improve the performance of scenarios where for example a large number of hosts is found for a given search term.

Furthermore, showing more than 80 results is not helpful to the user. When hitting this limit, users should either refine their search request or use a dedicated search dialog (such as the search dialogs in the service monitoring rules or hosts pages).

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