Scans can fail for multiple reasons (throttling, driver error, framework
aborting scans, etc). Add a retry mechanism for scans in this test
because these tests are dependendent on a successful scan being
completed.
Bug: 77601110
Test: atest ScanResultTest#testScanResultTimeStamp
Test: atest android.net.wifi.cts
Change-Id: Ic15e455394dde6fc01c01ea7f3eed2e27976d666