[Fix][Connector-V2] Fix mongodb cdc start up mode option values not right

[Hisoka-X]

Purpose of this pull request

In

seatunnel/seatunnel-connectors-v2/connector-cdc/connector-cdc-mongodb/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mongodb/config/MongodbSourceConfigProvider.java

Line 113 in 2ad7d65

if (startupOptions.getStartupMode() != StartupMode.INITIAL

, the mongo cdc start up mode only support INITIAL and TIMESTAMP. But the option rule config not right.

Does this PR introduce any user-facing change?

no

How was this patch tested?

add new test.

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 change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• Update the release-note.

[Hisoka-X]

cc @hailin0 @MonsterChenzhuo

[TaoZex]

+1

[kidloator]

目前2.3.5版本的startup_mode不支持latest吗？