Scanning with multiple keys from the same project fails

**Describe the bug**

If you have two different keys for the same project in a scan, only the first scan will be saved since the log files are named [project]_[timestamp].json.

**To Reproduce**

1. Put two different keys for the same project in a directory
2. Run GCP Scanner with these keys

**Expected behavior**

Perform the scan and create two different log files, one for each key, probably by adding the key id to the filename as well.

**Current behavior**

The first key works fine but the second will fail with an error since the name of the log files collide.