[chore](paimon) remove paimon-cpp dependency - #67385
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### What problem does this PR solve? Issue Number: N/A Related PR: apache#67378 Problem Summary: Doris still downloads, builds, links, and carries the deprecated paimon-cpp reader even though master plans serialized Paimon splits for the JNI reader. Remove the paimon-cpp thirdparty package, BE reader implementation, obsolete session-variable plumbing, and related tests. Keep the deprecated PaloInternalService field, TPaimonReaderType.PAIMON_CPP enum value, and IGNORE_PAIMON_CPP option for rolling-upgrade and configuration compatibility. Preserve Arrow as an independent shared thirdparty component so existing prebuilts remain usable and future automation artifacts no longer include paimon-cpp. ### Release note Remove the deprecated paimon-cpp reader and its build dependency. Paimon reads continue through the JNI and native readers. ### Check List (For Author) - Test: Unit Test and manual test - mvn -f fe/pom.xml -pl :fe-connector-paimon -am install -Dmaven.build.cache.enabled=false (553 tests passed, 1 live test skipped) - thirdparty Arrow and ADBC lifecycle tests - thirdparty download/mirror/checksum/retry script tests - build-support/check-build-hygiene.sh - shell syntax, YAML parsing, and git diff --check - Behavior changed: Yes. The paimon-cpp reader and enable_paimon_cpp_reader session variable are removed; deprecated wire fields remain for compatibility. - Does this need documentation: No
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What problem does this PR solve?
Issue Number: N/A
Related PR: #67378
Remove the deprecated paimon-cpp third-party dependency, BE reader implementation, obsolete session-variable plumbing, and related tests.
For rolling-upgrade and configuration compatibility, this PR retains the deprecated
PaloInternalServicefield,TPaimonReaderType.PAIMON_CPPenum value, andIGNORE_PAIMON_CPPoption. Arrow remains an independent shared third-party component, allowing existing compatible prebuilt packages to continue working.Release note
Remove the deprecated paimon-cpp reader and build dependency. Paimon reads continue through the JNI and native readers.
Check List (For Author)
enable_paimon_cpp_readersession variable are removed; deprecated wire fields remain for compatibility.