[FLINK-37427] Fix incorrect NPE message in StandaloneHaServices constructor

[lurongjiang]

What is the purpose of the change

developers receive unhelpful error messages when parameters are null.

Brief change log

Replace checkNotNull(clusterRestEndpointAddress, clusterRestEndpointAddress) with checkNotNull(clusterRestEndpointAddress, "clusterRestEndpointAddress") to ensure the exception message clearly identifies the null parameter.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no

[flinkbot]

CI report:

• 99d4355 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[davidradl]

nit: could we have a unit test, to check that null values are handled as expected. As this is a trivial change - it is your call as to whether you add this.

[davidradl]

nit: we could correct the javadoc and add this parameter while we are here.

[davidradl]

approving

• raised some nits but these are nice to haves and the change looks good.