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