[SPARK-37658][INFRA][PYTHON] Skip PIP packaging test in Jenkins

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

This PR proposes to skip PIP packaging test in Jenkins. We're already running it in GitHub Actions, and Jenkins is expected to be dropped soon this month.

### Why are the changes needed?

```
...
Writing pyspark-3.3.0.dev0/setup.cfg
Creating tar archive
removing 'pyspark-3.3.0.dev0' (and everything under it)
Installing dist into virtual env
Obtaining file:///home/jenkins/workspace/SparkPullRequestBuilder%402/python
pyspark requires Python '>=3.7' but the running Python is 3.6.8
Cleaning up temporary directory - /tmp/tmp.CCragmNU1X
[error] running /home/jenkins/workspace/SparkPullRequestBuilder2/dev/run-pip-tests ; received return code 1
Attempting to post to GitHub...
```

After we drop Python 3.6 at SPARK-37632, PIP packaging test fails intermittently https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/146255/console. Apparently, different Python versions are installed in some of Jenkins machines. We should skip the test in these cases.

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

No

### How was this patch tested?

Jenkins build in this PR would test it out.

Closes #34917 from HyukjinKwon/SPARK-37658.

Authored-by: Hyukjin Kwon <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: HyukjinKwon

dev/run-tests.py

@@ -500,9 +500,10 @@ def run_python_tests(test_modules, parallelism, with_coverage=False):
 
 
 def run_python_packaging_tests():
-    set_title_and_block("Running PySpark packaging tests", "BLOCK_PYSPARK_PIP_TESTS")
-    command = [os.path.join(SPARK_HOME, "dev", "run-pip-tests")]
-    run_cmd(command)
+    if not os.environ.get("AMPLAB_JENKINS"):
+        set_title_and_block("Running PySpark packaging tests", "BLOCK_PYSPARK_PIP_TESTS")
+        command = [os.path.join(SPARK_HOME, "dev", "run-pip-tests")]
+        run_cmd(command)
 
 
 def run_build_tests():