ComposeBom update and some cleanup

Author: Murat Yener

MacrobenchmarkSample/gradle/libs.versions.toml

@@ -3,7 +3,7 @@ agp = "8.1.1"
 activity = "1.7.2"
 appcompat = "1.6.1"
 benchmark = "1.2.0-rc01"
-composeBom = "2023.09.01"
+composeBom = "2023.09.02"
 composeCompiler = "1.4.7"
 constraintLayout = "2.1.4"
 core = "1.12.0"
@@ -18,7 +18,6 @@ lifecycle = "2.6.2"
 material = "1.9.0"
 profileInstaller = "1.3.1"
 rules = "1.5.0"
-testExt = "1.1.4"
 tracing = "1.1.0"
 uiAutomator = "2.3.0-alpha04"