Add 2 midges to test scanning in the test file

[Gara-Dorta]

If only one midge is present the proximity test in test.py fails. The tests should instead:

• Take two midges as input
• Set the id and group of both
• Check that scanned proximity data of one has the expected id and group from the previous step

This approach makes it that the scan test should always pass and also adds a test for the id and group, which is not tested as of now.

The last step requires expanding the returned data of the scanning function to include the id and group and not only the RSSI.