Add support to persist pip reports (#1224)

* add support to persist pip report

* pr feedback

src/Microsoft.ComponentDetection.Detectors/pip/PipCommandService.cs

@@ -131,7 +131,7 @@ public class PipCommandService : IPipCommandService
         var workingDir = new DirectoryInfo(this.pathUtilityService.GetParentDirectory(formattedPath));
 
         CommandLineExecutionResult command;
-        var reportName = Path.GetRandomFileName();
+        var reportName = Path.GetFileNameWithoutExtension(Path.GetRandomFileName()) + ".component-detection-pip-report.json";
         var reportFile = new FileInfo(Path.Combine(workingDir.FullName, reportName));
 
         string pipReportCommand;

src/Microsoft.ComponentDetection.Detectors/pip/PipReportComponentDetector.cs

@@ -22,6 +22,7 @@ public class PipReportComponentDetector : FileComponentDetector
     private const string PipReportOverrideBehaviorEnvVar = "PipReportOverrideBehavior";
     private const string PipReportSkipFallbackOnFailureEnvVar = "PipReportSkipFallbackOnFailure";
     private const string PipReportFileLevelTimeoutSecondsEnvVar = "PipReportFileLevelTimeoutSeconds";
+    private const string PipReportPersistReportsEnvVar = "PipReportPersistReports";
 
     private static readonly IList<string> PipReportPreGeneratedFilePatterns = new List<string> { "*.component-detection-pip-report.json", "component-detection-pip-report.json" };
 
@@ -300,6 +301,8 @@ public class PipReportComponentDetector : FileComponentDetector
         finally
         {
             // Clean up the report output JSON file so it isn't left on the machine.
+            if (!this.envVarService.IsEnvironmentVariableValueTrue(PipReportPersistReportsEnvVar))
+            {
                 foreach (var reportFile in reportFiles)
                 {
                     if (reportFile is not null && reportFile.Exists)
@@ -309,6 +312,7 @@ public class PipReportComponentDetector : FileComponentDetector
                 }
             }
         }
+    }
 
     private Dictionary<string, PipReportGraphNode> BuildGraphFromInstallationReport(PipInstallationReport report)
     {