[FLINK-24640][table] CEIL, FLOOR built-in functions for Timestamp should res…

[snuyanzin]

What is the purpose of the change

The PR makes org.apache.flink.table.utils.DateTimeUtils#timestampCeil and org.apache.flink.table.utils.DateTimeUtils#timestampFloor respecting DST

Verifying this change

There is org.apache.flink.table.utils.DateTimeUtilsTest introduced

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:

• a115d64b69b1471d3f09de4616253384992648e5 Azure: SUCCESS

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Automated Checks

Last check on commit 6803fe5578e495e0ed28f38a35aa6fa4e6afff1a (Tue Oct 26 01:40:32 UTC 2021)

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[snuyanzin]

@flinkbot run azure

[snuyanzin]

@matriv , @slinkydeveloper sorry for the poke. Since you 've contributed a lot to table functions dealing with date and time, could you please have a look here?

[snuyanzin]

@twalthr sorry for the poke could you please have a look once you have time