feat(repo): Ports repo file `Get` method from v2

This is a port of #3478 with some slight refactors to make it a bit more friendly.
It is technically a breaking change as it is changing the method signature from v2

Signed-off-by: Taylor Thomas <taylor.thomas@microsoft.com>

pkg/repo/repo.go

@@ -81,12 +81,18 @@ func (r *File) update(e *Entry) {
 
 // Has returns true if the given name is already a repository name.
 func (r *File) Has(name string) bool {
-	for _, rf := range r.Repositories {
-		if rf.Name == name {
-			return true
+	entry := r.Get(name)
+	return entry != nil
+}
+
+// Get returns an entry with the given name if it exists, otherwise returns nil
+func (r *File) Get(name string) *Entry {
+	for _, entry := range r.Repositories {
+		if entry.Name == name {
+			return entry
 		}
 	}
-	return false
+	return nil
 }
 
 // Remove removes the entry from the list of repositories.

pkg/repo/repo_test.go

@@ -91,6 +91,44 @@ func TestNewFile(t *testing.T) {
 	}
 }
 
+func TestRepoFile_Get(t *testing.T) {
+	repo := NewFile()
+	repo.Add(
+		&Entry{
+			Name: "first",
+			URL:  "https://example.com/first",
+		},
+		&Entry{
+			Name: "second",
+			URL:  "https://example.com/second",
+		},
+		&Entry{
+			Name: "third",
+			URL:  "https://example.com/third",
+		},
+		&Entry{
+			Name: "fourth",
+			URL:  "https://example.com/fourth",
+		},
+	)
+
+	name := "second"
+
+	entry := repo.Get(name)
+	if entry == nil {
+		t.Fatalf("Expected repo entry %q to be found", name)
+	}
+
+	if entry.URL != "https://example.com/second" {
+		t.Errorf("Expected repo URL to be %q but got %q", "https://example.com/second", entry.URL)
+	}
+
+	entry = repo.Get("nonexistent")
+	if entry != nil {
+		t.Errorf("Got unexpected entry %+v", entry)
+	}
+}
+
 func TestRemoveRepository(t *testing.T) {
 	sampleRepository := NewFile()
 	sampleRepository.Add(