Performance improvement.

Note: we temporarily removed the ability to filter hosts/jobs across multiple projects (removed the Any option in the project list as well disabled the ability to select multiple projects at a time) as it caused performance issue as qTest Launch needed to queries a huge amount of test runs and test logs in the database to build the Execution Summary report across those selected projects. We will re-enable this functionality in near future when we improve the performance of Execution Summary report for multiple projects.