Retrieve a known set of tests by id on a branch view

Reads exactly the requested tests in one call. Each test resolves on branch (master when omitted) the same way getTest resolves it with sourceControlTag: an explicit :version, else the branch version, else the master version when the branch is a feature branch or does not exist, else the test alone with no version or flows. An explicit :version that does not exist also returns the test alone. Tests that are missing, deleted, or in another workspace are left out, and the rest keep the requested order. variables is not computed.