[SPARK-29137][ML][PYTHON][TESTS] Increase the timeout for StreamingLi…

…nearRegressionWithTests.test_train_prediction

### What changes were proposed in this pull request?

It increases the timeout for `StreamingLinearRegressionWithTests.test_train_prediction`

```
Traceback (most recent call last):
  File "/home/jenkins/workspace/SparkPullRequestBuilder3/python/pyspark/mllib/tests/test_streaming_algorithms.py", line 503, in test_train_prediction
    self._eventually(condition)
  File "/home/jenkins/workspace/SparkPullRequestBuilder3/python/pyspark/mllib/tests/test_streaming_algorithms.py", line 69, in _eventually
    lastValue = condition()
  File "/home/jenkins/workspace/SparkPullRequestBuilder3/python/pyspark/mllib/tests/test_streaming_algorithms.py", line 498, in condition
    self.assertGreater(errors[1] - errors[-1], 2)
AssertionError: 1.672640157855923 not greater than 2
```

This could likely happen when the PySpark tests run in parallel and it become slow.

### Why are the changes needed?

To make the tests less flaky. Seems it's being reported multiple times:

https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/123144/consoleFull
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/123146/testReport/
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/123141/testReport/
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/123142/testReport/

### Does this PR introduce _any_ user-facing change?

No, test-only.

### How was this patch tested?

Jenkins will test it out.

Closes #28701 from HyukjinKwon/SPARK-29137.

Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

python/pyspark/mllib/tests/test_streaming_algorithms.py

@@ -463,7 +463,7 @@ def condition():
                 return True
             return "Latest errors: " + ", ".join(map(lambda x: str(x), errors))
 
-        eventually(condition)
+        eventually(condition, timeout=180.0)
 
 
 if __name__ == "__main__":