## What is the purpose of the change

Fixes classloading issues when using a UDF with constant parameters. Every
optimization might need to compile code (i.e. for constant folding), thus,
needs access to the user-code classloader.

## Brief change log

Set SQL Client's execution context class loader as thread classloader and use 
it for constant folding.

## Verifying this change

End-to-end test has been extended.

## 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, Yarn/Mesos, ZooKeeper: no
  - The S3 file system connector: no

## Documentation

  - Does this pull request introduce a new feature? no
  - If yes, how is the feature documented? not applicable


[ Full content available at: https://github.com/apache/flink/pull/6725 ]
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