[Fix][Connectors V2][CDC Oracle] oracle run in cdb+pdb mode, fix ORA-…

[screnwei]

…00942 error

Purpose of this pull request

Fix #8463

Does this PR introduce any user-facing change?

How was this patch tested?

I tested on my own mac pc.

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Hisoka-X]

Thanks @screnwei . Please add test case.

[Copilot]

Pull Request Overview

This PR fixes an issue with CDC Oracle by enabling the connector to run in both CDB and PDB modes, addressing the ORA-00942 error.

• Added a SQL constant and utility method in OracleConnectionUtils to fetch the current container name from the Oracle server.
• Updated OracleSnapshotSplitReadTask to switch the session to a designated PDB when the container name is "cdb$root".

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
seatunnel-connectors-v2/connector-cdc/connector-cdc-oracle/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/oracle/utils/OracleConnectionUtils.java	Added SHOW_CON_NAME constant and new method getCurrentContainerName to retrieve the container name.
seatunnel-connectors-v2/connector-cdc/connector-cdc-oracle/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/oracle/source/reader/fetch/scan/OracleSnapshotSplitReadTask.java	Added logic to use the container name and set the session to PDB if necessary.

[Copilot]

Typo in error message: 'Makesure' should be 'Make sure'.

Suggested change

	+ "'. Makesure your server is correctly configured");
	+ "'. Make sure your server is correctly configured");

[Copilot]

Typo in error message: 'Makesure' should be 'Make sure'.

Suggested change

	+ "'. Makesure your server is correctly configured",
	+ "'. Make sure your server is correctly configured",

[hailin0]

Why do you need to change this code?

For pdb you need to add configuration

source {
        Oracle-CDC {
              ......
              debezium {
                     database.pdb.name = "your pdb name"
              }
        }
}