[Data Sources] error list on medInria 5 dev

[mathildemerle]

I tested medInria 5 branch dev on my computer (Ubuntu 22) several times, including with @Florent2305, and there were some problems concerning data sources:

• No basic data source at opening of medInria. In Browser, the data source tab was empty and no data source in workspaces, so i couldn't get back my data.
• If there is no data source created, the search bar in workspaces should be disabled.
• No Shanoir data source type in Settings.
• No BIDS data source type in Settings.
• Datasource settings, click on Enter in a widget create a new widget instead of validate the widget your are currently.
• Data source browser: it would be nice to trigger the filter with Enter keyword in addition to Apply.

I have a long list of bugs in addition to that, from which i'll create some issues or PR