fix: restore PYROSCOPE_TMP_DIR as the Java constant name in Config

Previous commit shortened it to TMP_DIR; restore the full name so the
constant identifier matches its string value, consistent with the rest
of the Config constants.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: stevencurran

agent/src/main/java/io/pyroscope/javaagent/config/Config.java

@@ -58,7 +58,7 @@ public final class Config {
     private static final String PYROSCOPE_HTTP_HEADERS = "PYROSCOPE_HTTP_HEADERS";
     private static final String PYROSCOPE_TENANT_ID = "PYROSCOPE_TENANT_ID";
     private static final String PYROSCOPE_PROFILE_EXPORT_TIMEOUT = "PYROSCOPE_PROFILE_EXPORT_TIMEOUT";
-    private static final String TMP_DIR = "PYROSCOPE_TMP_DIR";
+    private static final String PYROSCOPE_TMP_DIR = "PYROSCOPE_TMP_DIR";
 
     /**
      * Experimental feature, may be removed in the future
@@ -666,7 +666,7 @@ private static String tenantID(ConfigurationProvider cp) {
     }
 
     private static String jfrDir(ConfigurationProvider cp) {
-        return cp.get(TMP_DIR);
+        return cp.get(PYROSCOPE_TMP_DIR);
     }
 
     private static Duration samplingDuration(ConfigurationProvider configurationProvider) {