Add a `workspace::DeploySearch` action and use it as a default for
"cmd-shift-f" binding. This action opens existing search tab if it
exists, or creates a new one otherwise. `workspace::NewSearch` action is
still available and always opens an existing search tab.

Release Notes:

- Added a `workspace::DeploySearch` action and use it as a default for
"cmd-shift-f" binding. `workspace::NewSearch` action is still available
and always opens an existing search tab.