Use fixed seed for test_from_json_struct_decimal

[thirtiseven]

This PR sets fixed seed for `test_from_json_struct_decimal' which has a datagen_seed issue, so they will not break CI. It is the only known datagen_seed issue without a fixed seed right now.

Related to #10898

It is targeted for 24.06 because it happened in the 24.06 re-release pipeline.

[thirtiseven]

build

[pxLi]

failed while submit tz case America/Punta_Arenas

never seen this before. rekick for now

Error: Not allowed to specify max heap(Xmx) memory settings 
through java options 
(was -ea -Duser.timezone=America/Punta_Arenas -Ddelta.log.cacheSize=10  
-Dlog4j.configuration=file:///home/jenkins/agent/workspace/jenkins-rapids_premerge-github-9769/integration_tests/src/test/resources/pytest_log4j.properties  
-Dlogfile=/home/jenkins/agent/workspace/jenkins-rapids_premerge-github-9769/integration_tests/target/run_dir-20240717071538-Xmx4/gw1_worker_logs.log 
-Dderby.system.home=./derby_gw1). Use the corresponding --driver-memory or spark.driver.memory configuration instead.

run_dir-20240717071538-Xmx4
the randomly generated run dir path contains -Xmx4, which helped us repro the spark bug https://issues.apache.org/jira/browse/SPARK-44242, lucky us!

[pxLi]

build