Add max-age for the symbol packages (#6343)

Author: cristinamanum

src/NuGetGallery.Core/Services/CloudBlobCoreFileStorageService.cs

@@ -569,12 +569,12 @@ private static string GetCacheControl(string folderName)
             switch (folderName)
             {
                 case CoreConstants.PackagesFolderName:
+                case CoreConstants.SymbolPackagesFolderName:
                     return CoreConstants.DefaultCacheControl;
 
                 case CoreConstants.PackageBackupsFolderName:
                 case CoreConstants.UploadsFolderName:
                 case CoreConstants.ValidationFolderName:
-                case CoreConstants.SymbolPackagesFolderName:
                 case CoreConstants.SymbolPackageBackupsFolderName:
                 case CoreConstants.DownloadsFolderName:
                 case CoreConstants.PackageReadMesFolderName:

tests/NuGetGallery.Core.Facts/Services/CloudBlobCoreFileStorageServiceFacts.cs

@@ -53,6 +53,7 @@ public override IEnumerable<object[]> GetData(MethodInfo testMethod)
                     new object[] { CoreConstants.PackageBackupsFolderName, true, CoreConstants.PackageContentType },
                     new object[] { CoreConstants.PackageReadMesFolderName, false, CoreConstants.TextContentType },
                     new object[] { CoreConstants.PackagesFolderName, true, CoreConstants.PackageContentType },
+                    new object[] { CoreConstants.SymbolPackagesFolderName, true, CoreConstants.PackageContentType },
                     new object[] { CoreConstants.UploadsFolderName, false, CoreConstants.PackageContentType },
                     new object[] { CoreConstants.UserCertificatesFolderName, false, CoreConstants.CertificateContentType },
                     new object[] { CoreConstants.ValidationFolderName, false, CoreConstants.PackageContentType }
@@ -535,7 +536,7 @@ public async Task WillSetTheBlobControlCacheOnPackagesFolder(string folderName)
 
                 fakeBlob.Verify();
 
-                if (folderName == CoreConstants.PackagesFolderName)
+                if (folderName == CoreConstants.PackagesFolderName || folderName == CoreConstants.SymbolPackagesFolderName)
                 {
                     Assert.Equal(CoreConstants.DefaultCacheControl, fakeBlob.Object.Properties.CacheControl);
                 }