Fix cloning from ADO repos

Small path bug, "git clone" by default clones to a new folder based on
the last part of the repo name. So running something like `pulumi new
https://fraser0275@dev.azure.com/fraser0275/fraser/_git/fraser` resulted
in us making a folder like /tmp/pulumi-templates-1234/fraser with all
the templates in it. That last part of the path was unexpected, because
when we use gogit it clones directly into the target directory we give
it.

Simple fix to just add `.` to the git clone command. I also added some
logging while I was about here, given it helped me work out this issue.

changelog/pending/20221006--cli-new--fix-ado-repos.yaml

@@ -0,0 +1,4 @@
+changes:
+- type: fix
+  scope: cli/new
+  description: Fix cloning templates from Azure DevOps repos.

sdk/go/common/util/gitutil/git.go

@@ -32,6 +32,7 @@ import (
 	"github.com/go-git/go-git/v5/storage/memory"
 	"github.com/pkg/errors"
 	"github.com/pulumi/pulumi/sdk/v3/go/common/util/fsutil"
+	"github.com/pulumi/pulumi/sdk/v3/go/common/util/logging"
 )
 
 // VCSKind represents the hostname of a specific type of VCS.
@@ -280,6 +281,7 @@ func GitCloneAndCheckoutCommit(url string, commit plumbing.Hash, path string) er
 }
 
 func GitCloneOrPull(rawurl string, referenceName plumbing.ReferenceName, path string, shallow bool) error {
+	logging.V(10).Infof("Attempting to clone from %s at ref %s", rawurl, referenceName)
 	if u, err := url.Parse(rawurl); err == nil && u.Hostname() == AzureDevOpsHostName {
 		// system-installed git is used to clone Azure DevOps repositories
 		// due to https://github.com/go-git/go-git/issues/64
@@ -346,7 +348,7 @@ func gitCloneOrPullSystemGit(url string, referenceName plumbing.ReferenceName, p
 	if _, err := os.Stat(filepath.Join(path, ".git")); os.IsNotExist(err) {
 		// Repo does not exist, clone it.
 		gitArgs = []string{
-			"clone", url,
+			"clone", url, ".",
 		}
 		// For shallow clones, use a depth of 1.
 		if shallow {

sdk/go/common/workspace/templates.go

@@ -30,6 +30,7 @@ import (
 
 	"github.com/pulumi/pulumi/sdk/v3/go/common/util/contract"
 	"github.com/pulumi/pulumi/sdk/v3/go/common/util/gitutil"
+	"github.com/pulumi/pulumi/sdk/v3/go/common/util/logging"
 )
 
 const (
@@ -373,8 +374,11 @@ func RetrieveGitFolder(rawurl string, path string) (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("failed to get git ref: %w", err)
 	}
-	if ref != "" {
+	logging.V(10).Infof(
+		"Attempting to fetch from %s at commit %s@%s for subdirectory '%s'",
+		url, ref, commit, subDirectory)
 
+	if ref != "" {
 		// Different reference attempts to cycle through
 		// We default to master then main in that order. We need to order them to avoid breaking
 		// already existing processes for repos that already have a master and main branch.
@@ -405,6 +409,7 @@ func RetrieveGitFolder(rawurl string, path string) (string, error) {
 
 	// Verify the sub directory exists.
 	fullPath := filepath.Join(path, filepath.FromSlash(subDirectory))
+	logging.V(10).Infof("Cloned %s at commit %s@%s to %s", url, ref, commit, fullPath)
 	info, err := os.Stat(fullPath)
 	if err != nil {
 		return "", err