fix(core): Report replay sampling callback errors

Record callback_error/replay when beforeErrorSampling throws while the replay
controller has an active replay ID. Do not report a loss when no replay is active.

Refs GH-6081
Co-Authored-By: Claude <noreply@anthropic.com>

Author: adinauer

sentry/src/main/java/io/sentry/SentryClient.java

@@ -246,6 +246,11 @@ private boolean shouldApplyScopeData(final @NotNull CheckIn event, final @NotNul
                   SentryLevel.ERROR,
                   "The beforeErrorSampling callback threw an exception. Skipping replay capture.",
                   e);
+          if (!SentryId.EMPTY_ID.equals(options.getReplayController().getReplayId())) {
+            options
+                .getClientReportRecorder()
+                .recordLostEvent(DiscardReason.CALLBACK_ERROR, DataCategory.Replay);
+          }
           shouldCaptureReplay = false;
         }
       }

sentry/src/test/java/io/sentry/SentryClientTest.kt

@@ -3964,6 +3964,7 @@ class SentryClientTest {
   @Test
   fun `beforeErrorSampling throwing exception skips replay but still sends errors and crashes`() {
     val replayController = mock<ReplayController>()
+    whenever(replayController.replayId).thenReturn(SentryId())
     whenever(replayController.captureReplay(anyOrNull())).thenReturn(SentryId.EMPTY_ID)
     fixture.sentryOptions.setReplayController(replayController)
     val logger = mock<ILogger>()
@@ -4000,11 +4001,16 @@ class SentryClientTest {
         "The beforeErrorSampling callback threw an exception. Skipping replay capture.",
         exception,
       )
+    assertClientReport(
+      fixture.sentryOptions.clientReportRecorder,
+      listOf(DiscardedEvent(DiscardReason.CALLBACK_ERROR.reason, DataCategory.Replay.category, 2)),
+    )
   }
 
   @Test
   fun `beforeErrorSampling throwing exception does not prevent replay capture for subsequent events`() {
     val replayController = mock<ReplayController>()
+    whenever(replayController.replayId).thenReturn(SentryId.EMPTY_ID)
     whenever(replayController.captureReplay(anyOrNull())).thenReturn(SentryId.EMPTY_ID)
     fixture.sentryOptions.setReplayController(replayController)
     var invocations = 0
@@ -4027,6 +4033,7 @@ class SentryClientTest {
     assertThat(invocations).isEqualTo(2)
     verify(replayController).captureReplay(false)
     verify(fixture.transport, times(2)).send(any(), anyOrNull())
+    assertClientReport(fixture.sentryOptions.clientReportRecorder, emptyList())
   }
 
   @Test