branch-4.1: [Improve](streaming-job) support specifying offset for StreamingInsertJob create and alter #62490#62853
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…tJob create and alter (#62490) ## Summary - Support specifying offset (binlog position, LSN, named modes) when creating or altering a StreamingInsertJob via `FROM MYSQL/POSTGRES` path. - FE: extend `DataSourceConfigValidator` to validate offset formats (initial/snapshot/latest/earliest/JSON); `earliest` is MySQL-only, rejected for PostgreSQL. Implement `JdbcSourceOffsetProvider.deserializeOffsetProperty()` for named modes and JSON offset parsing. Remove S3-only restriction in `StreamingInsertJob.initInsertJob()` and `modifyPropertiesInternal()` so CDC jobs can also use offset property. On ALTER, sync offset to `sourceProperties` for the FROM...TO path. - BE: support JSON LSN offset `{"lsn":"N"}` in `PostgresSourceReader.generatePostgresConfig()`, and handle `SPECIFIC_OFFSETS` mode in `JdbcIncrementalSourceReader.getStartOffsetFromConfig()`. - Fix `JdbcOffset.isValidOffset()` and `toSerializedJson()` to return meaningful values instead of hardcoded false/null.
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Cherry-picked from #62490