Fix flaky TbRateLimitsTest timing tolerance

Increased timing tolerance gap from 500ms to 1000ms in both
testRateLimitWithGreedyRefill and testRateLimitWithIntervalRefill
to prevent ConditionTimeoutException caused by scheduling jitter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

common/message/src/test/java/org/thingsboard/server/common/msg/tools/TbRateLimitsTest.java

@@ -42,7 +42,7 @@ public class TbRateLimitsTest {
         assertThat(rateLimits.tryConsume()).as("new token is available").isFalse();
 
         int expectedRefillTime = (int) (((double) period / capacity) * 1000);
-        int gap = 500;
+        int gap = 1000;
 
         for (int i = 0; i < capacity; i++) {
             await("token refill for rate limit " + rateLimitConfig)
@@ -71,7 +71,7 @@ public class TbRateLimitsTest {
         assertThat(rateLimits.tryConsume()).as("new token is available").isFalse();
 
         int expectedRefillTime = period * 1000;
-        int gap = 500;
+        int gap = 1000;
 
         await("tokens refill for rate limit " + rateLimitConfig)
                 .pollInterval(new FixedPollInterval(10, TimeUnit.MILLISECONDS))