chore: add openvpn experiment to experimental card. (#811)

Fixes  ooni/probe#2795

## Proposed Changes

  - Add OpenVPN to experimental tests/
  - Update tests to reflect change in experimental test.

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![Screenshot_20240827_154420](https://github.com/user-attachments/assets/6fc2ceae-6966-495e-aa7f-5932fed56a82)
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![Screenshot_20240827_154432](https://github.com/user-attachments/assets/e43350e0-b25c-450e-afc5-c37bc6b97348)
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app/src/main/java/org/openobservatory/ooniprobe/common/OONIDescriptor.kt

@@ -297,7 +297,7 @@ enum class OONITests(
         dataUsage = R.string.TestResults_NotAvailable,
         nettests = listOf(
             BaseNettest(name = "stunreachability"),
-            BaseNettest(name = "dnscheck"),
+            BaseNettest(name = "openvpn"),
             BaseNettest(name = "echcheck"),
         ),
         longRunningTests = listOf(
@@ -346,7 +346,7 @@ enum class OONITests(
         return """
         * [STUN Reachability](https://github.com/ooni/spec/blob/master/nettests/ts-025-stun-reachability.md)
 
-        * [DNS Check](https://github.com/ooni/spec/blob/master/nettests/ts-028-dnscheck.md)
+        * [OpenVPN](https://github.com/ooni/spec/blob/master/nettests/ts-040-openvpn.md)
 
         * [RiseupVPN](https://ooni.org/nettest/riseupvpn/)
 

app/src/test/java/org/openobservatory/ooniprobe/test/suite/ExperimentalSuiteTest.java

@@ -48,7 +48,7 @@ public void getTestList_experimental_foreground() {
         assertEquals(Experimental.class, tests.get(1).getClass());
         assertEquals(Experimental.class, tests.get(2).getClass());
         assertEquals("stunreachability", tests.get(0).getName());
-        assertEquals("dnscheck", tests.get(1).getName());
+        assertEquals("openvpn", tests.get(1).getName());
         assertEquals("echcheck", tests.get(2).getName());
     }
 
@@ -68,7 +68,7 @@ public void getTestList_experimental_on_autorun_on() {
         assertEquals(Experimental.class, tests.get(4).getClass());
 
         assertEquals("stunreachability", tests.get(0).getName());
-        assertEquals("dnscheck", tests.get(1).getName());
+        assertEquals("openvpn", tests.get(1).getName());
         assertEquals("echcheck", tests.get(2).getName());
         assertEquals("torsf", tests.get(3).getName());
         assertEquals("vanilla_tor", tests.get(4).getName());