[FLINK-34477][table] Support capture groups in REGEXP_REPLACE

[jeyhunkarimov]

What is the purpose of the change

Support capture groups in REGEXP_REPLACE

Brief change log

• Added support for capture groups by skipping the dollar sign
• Adjusted some tests and added new ones

Verifying this change

Tests: org.apache.flink.table.planner.expressions.ScalarFunctionsTest::testRegexpReplace

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:

• 55d99d52c14f9cfdb878651be9a18455339bb097 Azure: SUCCESS

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

[jeyhunkarimov]

Hi @JingGe could you please review this PR in your available time? Thanks!