[Repository Signing] Enable the extraction of repository signatures (#512)

Updates the Process Signature's configuration so that it saves repository signatures to the database. This MUST be deployed after the Orchestrator's test mode of repository signing has been deployed (see [this](https://nuget.visualstudio.com/NuGetMicrosoft/_git/NuGetDeployment/pullrequest/549?_a=overview))

Author: loic-sharma

src/Validation.PackageSigning.ProcessSignature/Settings/dev.json

@@ -23,7 +23,7 @@
       "cf6ce6768ef858a3a667be1af8aa524d386c7f59a34542713f5dfb0d79acf3dd"
     ],
     "V3ServiceIndexUrl": "https://apidev.nugettest.org/v3/index.json",
-    "CommitRepositorySignatures": false
+    "CommitRepositorySignatures": true
   },
 
   "PackageDownloadTimeout": "00:10:00",

src/Validation.PackageSigning.ProcessSignature/Settings/int.json

@@ -23,7 +23,7 @@
       "cf6ce6768ef858a3a667be1af8aa524d386c7f59a34542713f5dfb0d79acf3dd"
     ],
     "V3ServiceIndexUrl": "https://apiint.nugettest.org/v3/index.json",
-    "CommitRepositorySignatures": false
+    "CommitRepositorySignatures": true
   },
 
   "PackageDownloadTimeout": "00:10:00",

src/Validation.PackageSigning.ProcessSignature/Settings/prod.json

@@ -23,7 +23,7 @@
       "0e5f38f57dc1bcc806d8494f4f90fbcedd988b46760709cbeec6f4219aa6157d"
     ],
     "V3ServiceIndexUrl": "https://api.nuget.org/v3/index.json",
-    "CommitRepositorySignatures":  false
+    "CommitRepositorySignatures": true
   },
 
   "PackageDownloadTimeout": "00:10:00",