Do not download ARM binaries in testarchive (#3501)

## Why
We do not need ARM binaries right now, so skip downloads for them.

Builds on top of: #3500

## Tests
Modified unit tests.

Author: shreyas-goenka

internal/testarchive/archive.go

@@ -107,11 +107,14 @@ func createArchive(archiveDir, binDir, repoRoot string) error {
 	// the CPU architecture to keep the door open for future optimizations.
 	downloaders := []downloader{
 		goDownloader{arch: "amd64", binDir: binDir},
-		goDownloader{arch: "arm64", binDir: binDir},
 		uvDownloader{arch: "amd64", binDir: binDir},
-		uvDownloader{arch: "arm64", binDir: binDir},
 		jqDownloader{arch: "amd64", binDir: binDir},
-		jqDownloader{arch: "arm64", binDir: binDir},
+
+		// TODO: Serverless clusters do not support arm64 yet.
+		// Enable ARM64 once serverless clusters support it.
+		// goDownloader{arch: "arm64", binDir: binDir},
+		// uvDownloader{arch: "arm64", binDir: binDir},
+		// jqDownloader{arch: "arm64", binDir: binDir},
 	}
 
 	for _, downloader := range downloaders {

internal/testarchive/archive_test.go

@@ -28,13 +28,16 @@ func TestArchive(t *testing.T) {
 
 	// Go installation is a directory because it includes the
 	// standard library source code along with the Go binary.
-	assert.FileExists(t, filepath.Join(assertDir, "bin", "arm64", "go", "bin", "go"))
 	assert.FileExists(t, filepath.Join(assertDir, "bin", "amd64", "go", "bin", "go"))
-	assert.FileExists(t, filepath.Join(assertDir, "bin", "arm64", "uv"))
 	assert.FileExists(t, filepath.Join(assertDir, "bin", "amd64", "uv"))
-	assert.FileExists(t, filepath.Join(assertDir, "bin", "arm64", "jq"))
 	assert.FileExists(t, filepath.Join(assertDir, "bin", "amd64", "jq"))
 
+	// TODO: Serverless clusters do not support arm64 yet.
+	// Assert these files exist after we support arm64.
+	assert.NoFileExists(t, filepath.Join(assertDir, "bin", "arm64", "go", "bin", "go"))
+	assert.NoFileExists(t, filepath.Join(assertDir, "bin", "arm64", "uv"))
+	assert.NoFileExists(t, filepath.Join(assertDir, "bin", "arm64", "jq"))
+
 	assert.FileExists(t, filepath.Join(assertDir, "cli", "go.mod"))
 	assert.FileExists(t, filepath.Join(assertDir, "cli", "go.sum"))
 }