Update output directory used in TestArchive (#11406)

This change uses a different  as part of the TestArchive output path to fix
an intermittently failing test case on Windows caused by using the same
output name across test cases.

Originally tired to use t.TempDir() to gt a temp path but ran into
errors with parsing the config on Windows.

```
Unable to parse test config: invalid character 'U' in string escape code
```

post-processor/compress/post-processor_test.go

@@ -235,6 +235,7 @@ func TestArchive(t *testing.T) {
 		},
 	}
 
+	tmpArchiveFile := "temp-archive-package"
 	for format, unzip := range tc {
 		t.Run(format, func(t *testing.T) {
 			config := fmt.Sprintf(`
@@ -242,11 +243,11 @@ func TestArchive(t *testing.T) {
 			"post-processors": [
 				{
 					"type": "compress",
-					"output": "package.%s"
+					"output": "%s.%s"
 				}
 			]
 		}
-		`, format)
+		`, tmpArchiveFile, format)
 
 			artifact := testArchive(t, config)
 			defer func() {
@@ -256,7 +257,7 @@ func TestArchive(t *testing.T) {
 				}
 			}()
 
-			filename := fmt.Sprintf("package.%s", format)
+			filename := fmt.Sprintf("%s.%s", tmpArchiveFile, format)
 			// Verify things look good
 			_, err := os.Stat(filename)
 			if err != nil {