[FLINK-39317] Add Source e2e with Flink2.2.

[lvyanquan]

[FLINK-39317] Add Source E2E with Flink 2.2

Summary

This PR adds support for running Source E2E tests with Flink 2.2, introducing Maven profiles to switch between Flink 1.x and Flink 2.x compatibility layers.

Changes

CI Configuration

• Add new source_e2e_2_x job in GitHub workflow to run Source E2E tests with Flink 2.2.0
• Use -Pflink2 Maven profile for Flink 2.x compatibility

Maven Profiles

• Add flink1 profile (default) using flink-cdc-flink1-compat
• Add flink2 profile using flink-cdc-flink2-compat
• Update all SQL connector packages to include the appropriate flink-cdc-flink*-compat artifact

Bug Fixes

• Fix paimon artifact version variable: change ${flink.major.version} to ${paimon.flink.major.version} in pipeline e2e tests
• Add missing createWriter(InitContext) method to StatefulSink interface in flink2-compat module

Affected Connectors

All SQL connectors now include the flink-cdc-flink*-compat dependency:

• flink-sql-connector-mongodb-cdc
• flink-sql-connector-mysql-cdc
• flink-sql-connector-oceanbase-cdc
• flink-sql-connector-oracle-cdc
• flink-sql-connector-postgres-cdc
• flink-sql-connector-sqlserver-cdc
• flink-sql-connector-tidb-cdc

Test Plan

• Source E2E tests pass with Flink 1.x (default profile)
• Source E2E tests pass with Flink 2.2.0 (-Pflink2 profile)
• CI workflow runs successfully for both profiles