Add the option to disable auto-reconnection in the search dialog

**Is your feature request related to a problem? Please describe.**
Hello
Every time I open the DB search dialog (clicking the magnifying lens in the top bar) DBeaver will attempt to reconnect to the DB where the last search was performed. I'd like to have the option to disable this behavior.

**Describe the solution you'd like**
1. I click the magnifying lens because I want to search for something in the DB metadata
2. The search editor opens up
3. The search dialog editor won't auto-select disconnected databases

**Describe alternatives you've considered**
I already disabled all kinds of auto-reconnect options from settings (https://github.com/dbeaver/dbeaver/issues/8405)