[FLINK-24676][table-planner] Fix schema mismatch exception if explain insert with partial column

[godfreyhe]

What is the purpose of the change

Fix schema mismatch exception if explain insert with partial column, please refer to the desc of FLINK-24676 to see the example

Brief change log

• PreValidateReWriter should consider SqlRichExplain if the statement is insert

Verifying this change

This change added tests and can be verified as follows:

• Extended test in TableEnvironmentTest#testExecuteSqlWithExplainInsert to test the change

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

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[flinkbot]

CI report:

• 0d91821 Azure: SUCCESS

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Last check on commit 0d91821 (Thu Oct 28 02:43:54 UTC 2021)

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[wenlong88]

LGTM

[godfreyhe]

Thanks for the review, I will merge it