Drop tests asserting defaults on invalid time units

Parsing invalid time units now throws IllegalArgumentException (since
change I23f5586e1f6) instead of silently falling back to defaults. The
high-availability configuration tests were still asserting that an
invalid value should yield the default, which no longer reflects the
current contract and caused brittle failures.

This change removes those assertions from ConfigurationTest for:
- http.connectionTimeout
- http.socketTimeout
- http.retryInterval

Rationale:
- These checks verify ConfigUtil’s parsing behavior, which is already
  covered by its own test suite.
- The plugin does not promise a default-on-error fallback; encoding that
  expectation in its tests is misleading.
- Dropping the assertions decouples the plugin tests from lower-level
  parsing details and prevents false failures after the API change.

Bug: Issue 445404588
Change-Id: Ie112b7dce05d35cdd4e4e3028c38b0d7d0d660b4

src/test/java/com/ericsson/gerrit/plugins/highavailability/ConfigurationTest.java

diff --git a/src/test/java/com/ericsson/gerrit/plugins/highavailability/ConfigurationTest.java b/src/test/java/com/ericsson/gerrit/plugins/highavailability/ConfigurationTest.java
index b51e1a0..0fb7dad 100644
--- a/src/test/java/com/ericsson/gerrit/plugins/highavailability/ConfigurationTest.java
+++ b/src/test/java/com/ericsson/gerrit/plugins/highavailability/ConfigurationTest.java
@@ -217,9 +217,6 @@
 
     globalPluginConfig.setInt(HTTP_SECTION, null, CONNECTION_TIMEOUT_KEY, TIMEOUT);
     assertThat(getConfiguration().http().connectionTimeout().toMillis()).isEqualTo(TIMEOUT);
-
-    globalPluginConfig.setString(HTTP_SECTION, null, CONNECTION_TIMEOUT_KEY, INVALID_INT);
-    assertThat(getConfiguration().http().connectionTimeout()).isEqualTo(DEFAULT_TIMEOUT);
   }
 
   @Test
@@ -228,9 +225,6 @@
 
     globalPluginConfig.setInt(HTTP_SECTION, null, SOCKET_TIMEOUT_KEY, TIMEOUT);
     assertThat(getConfiguration().http().socketTimeout().toMillis()).isEqualTo(TIMEOUT);
-
-    globalPluginConfig.setString(HTTP_SECTION, null, SOCKET_TIMEOUT_KEY, INVALID_INT);
-    assertThat(getConfiguration().http().socketTimeout()).isEqualTo(DEFAULT_TIMEOUT);
   }
 
   @Test
@@ -256,9 +250,6 @@
 
     globalPluginConfig.setInt(HTTP_SECTION, null, RETRY_INTERVAL_KEY, RETRY_INTERVAL);
     assertThat(getConfiguration().http().retryInterval().toMillis()).isEqualTo(RETRY_INTERVAL);
-
-    globalPluginConfig.setString(HTTP_SECTION, null, RETRY_INTERVAL_KEY, INVALID_INT);
-    assertThat(getConfiguration().http().retryInterval()).isEqualTo(DEFAULT_RETRY_INTERVAL);
   }
 
   @Test