Fix library test to not expect code location with old deps

The library instrumentation cannot capture code location attributes
when running with older Log4j2 versions. The override now correctly
returns an empty list for all non-testLatestDeps cases, not just
AsyncLogger scenarios.

Author: trask

instrumentation/log4j/log4j-appender-2.17/library/src/test/java/io/opentelemetry/instrumentation/log4j/appender/v2_17/Log4j2Test.java

@@ -36,11 +36,9 @@ protected InstrumentationExtension testing() {
 
   @Override
   protected List<AttributeAssertion> addCodeLocationAttributes(String methodName) {
-    // For library tests, AsyncLogger can't capture code location in older versions
-    String selector = System.getProperty("Log4j2.contextSelector");
-    boolean async = selector != null && selector.endsWith("AsyncLoggerContextSelector");
-    if (async && !Boolean.getBoolean("testLatestDeps")) {
-      // source info is not available by default when async logger is used in non latest dep tests
+    // Library instrumentation does not capture code location in older versions.
+    // Code location is only available when using latest deps (which have the necessary APIs).
+    if (!Boolean.getBoolean("testLatestDeps")) {
       return new ArrayList<>();
     }