[fix](memory) Fix adjust cache capacity (#45603)

### What problem does this PR solve?

If the cache capacity adjustment is not completed within 500ms
(conf::memory_gc_sleep_time_ms), the next adjustment will be skipped.

In some scenarios, after Memory GC adjusts the cache capacity to 0, the
next adjustment to restore the cache capacity is skipped, the cache
capacity will remain at 0 for a long time.

be/src/common/daemon.cpp

@@ -230,6 +230,11 @@ void refresh_memory_state_after_memory_change() {
 }
 
 void refresh_cache_capacity() {
+    if (doris::GlobalMemoryArbitrator::cache_adjust_capacity_notify.load(
+                std::memory_order_relaxed)) {
+        // the last cache capacity adjustment has not been completed.
+        return;
+    }
     if (refresh_cache_capacity_sleep_time_ms <= 0) {
         auto cache_capacity_reduce_mem_limit = int64_t(
                 doris::MemInfo::soft_mem_limit() * config::cache_capacity_reduce_mem_limit_frac);
@@ -247,6 +252,8 @@ void refresh_cache_capacity() {
                     new_cache_capacity_adjust_weighted;
             doris::GlobalMemoryArbitrator::notify_cache_adjust_capacity();
             refresh_cache_capacity_sleep_time_ms = config::memory_gc_sleep_time_ms;
+        } else {
+            refresh_cache_capacity_sleep_time_ms = 0;
         }
     }
     refresh_cache_capacity_sleep_time_ms -= config::memory_maintenance_sleep_time_ms;