[FLINK-21943][core] Remove redundant checkNotNull in Transformation#setResources

[plugatarev]

What is the purpose of the change

Remove redundant checkNotNull in setResources

Brief change log

• Remove redundant checkNotNull in setResources
• Replace HashMap with EnumMap for managedMemoryOperatorScopeUseCaseWeights
• Simplify assertThat to assertEquals
• Add tests

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:

• bbcbf61 Azure: SUCCESS

Bot commands

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

[reswqa]

Thanks for the PR. I left some comments, please take a look.

BTW, we should rename the commit message to [FLINK-21943][core] Remove redundant checkNotNull in Transformation#setResources

[reswqa]

Thanks for the quick update, LGTM.

[plugatarev]

Thanks for the quick update, LGTM.

Thanks for the quick review, merge please