fix(engine): expose session close (#852)

Fixes ooni/probe#2810

## Proposed Changes

  - Exposes the `close` function for the engine session 
- Invokes the `close` function while downloading urls for
webconnectivity to ensure the running psiphon tunnel (and engine
session) is closed before the experiment run
- Changes in engine api surface:
ooni/probe-cli#1657

app/src/main/java/org/openobservatory/ooniprobe/test/TestAsyncTask.java

@@ -197,6 +197,9 @@ private void downloadURLs() {
                 currentTest.setMax_runtime(app.getPreferenceManager().getMaxRuntime());
             }
             publishProgress(URL);
+
+            // we close the session to ensure that we have no running circumvention tunnels
+            session.close();
         } catch (Exception e) {
             e.printStackTrace();
             ThirdPartyServices.logException(e);

engine/src/main/java/org/openobservatory/engine/OONISession.java

@@ -38,4 +38,7 @@ public interface OONISession {
     OONIRunDescriptor getLatestOONIRunLink(OONIContext ctx, String probeServicesURL, long id) throws Exception;
 
     OONIRunRevisions getOONIRunLinkRevisions(@Nullable OONIContext ooniContext, @NotNull String probeServicesURL, long runId) throws Exception ;
+
+    /** close closes the session along with any running circumvention tunnels */
+    void close() throws Exception;
 }

engine/src/main/java/org/openobservatory/engine/PESession.java

@@ -58,4 +58,8 @@ public OONIRunRevisions getOONIRunLinkRevisions(OONIContext ooniContext, @NotNul
 
         return revisions;
     }
+
+    public void close() throws Exception {
+        session.close();
+    }
 }

gradle/libs.versions.toml

@@ -41,7 +41,7 @@ markwon = "4.6.2"
 shapeofview = "1.4.7"
 targetSdk = "35"
 minSdk = "21"
-oonimkall = "2024.08.08-091959"
+oonimkall = "2024.11.26-053000"
 
 junit = "4.13.2"
 dbflow = "4.2.4"