fix: remove overly strict assertion during stream pause/resume (#18131)

(cherry picked from commit 190875c)

src/stream/src/executor/stream_reader.rs

@@ -95,14 +95,18 @@ impl<const BIASED: bool, M: Send + 'static> StreamReaderWithPause<BIASED, M> {
 
     /// Pause the data stream.
     pub fn pause_stream(&mut self) {
-        assert!(!self.paused, "already paused");
+        if self.paused {
+            tracing::warn!("already paused");
+        }
         tracing::info!("data stream paused");
         self.paused = true;
     }
 
-    /// Resume the data stream. Panic if the data stream is not paused.
+    /// Resume the data stream.
     pub fn resume_stream(&mut self) {
-        assert!(self.paused, "not paused");
+        if !self.paused {
+            tracing::warn!("not paused");
+        }
         tracing::info!("data stream resumed");
         self.paused = false;
     }